How Often To Water Marijuana Seeds

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Learn everything you need to know about watering your cannabis plants. No more guessing or worrying! You probably never thought about it but watering weed is a science on its own. Here are all the ins and outs of how to water like a pro. Water plays a crucial role in keeping your marijuana plant healthy. Get tips from the experts at Leafly to keep your weed plants hydrated, and learn how to flush them properly.

How Often Do I Water Indoor Marijuana Plants?

If you’re growing marijuana in soil or another growing medium like coco coir, you will have to hand-water your plants. Watering is an important part of growing cannabis indoors, and knowing how to water your plants will save you a lot of frustration!

How often do you give your cannabis water?

Well, you will want to water your marijuana whenever the top of the soil or growing medium starts to feel dry. I like to water when the medium feel dry up to my first knuckle, or about an inch.

  • Soil – Water plants when the soil feels dry up to your first knuckle (or if the pot feels light).
  • Coco Coir – Aim to water plants every 1-2 days. If coco is staying wet for 3+ days, try giving less water at a time until plants get bigger and start drinking more. Don’t wait for your coco coir to dry out, but don’t water if the top inch feels “wet”. If the container feels light, it’s definitely time to water!

How to water cannabis properly (when using a well-draining potting mixture with liquid nutrients)…

In soil, wait until the topsoil feels dry about an inch deep (up to your first knuckle – just use your finger to poke a hole in the soil and see if it feels dry).

In coco coir, you want to water every 1-2 days if possible and adjust the amount of water you give accordingly. The top inch doesn’t need to completely dry out between waterings.

If you’re regularly adding nutrients in the water, give enough water each time that you get 10-20% extra runoff water drain out the bottom of your pot. This prevents a buildup in the potting mixture because otherwise, you are continuously adding more nutrients to the system.

Go back to step 1. Note: If water takes a long time to come out the bottom, or if pots take longer than 5 days to dry out before the next watering, you may actually have a problem with drainage (more info below) or need to give less water at a time. If your plants are very small compared to the container they’re in, give water more sparingly until plants get bigger.

Growing in Super Soil?

  • If you’re growing in super soil or another heavily amended potting mix, you may not need to add extra nutrients to the water because your plants can get all their nutrients directly from the soil.
  • Any time you’re not adding extra nutrients in the water, you want to avoid getting runoff water because it will carry away some of the nutrients in the soil.
  • Watering until you get runoff is important when using liquid nutrients because it helps prevent nutrient build up, but with super soil try to give just enough water that you wet the entire medium but don’t get extra water coming out the bottom.

Some growers swear by the “lift the pot” method to decide when to water your plants (basically wait until your pot feels “light” since the plants have used up all the water). It’s up to you to decide what’s easier for you.

I usually water my cannabis with a 1-gallon water jug for small grows, or 5-gallon jugs for larger ones. Runoff water is collected in the trays and after a few minutes I suck it all up with a small wet vac .

How to Provide the Water

When I first started growing, I gave my plants water using a watering can. A watering can works great, but it’s hard to water a bunch of plants with one watering can because you have to keep filling it up.

An old-fashioned watering can will get the job done, but they typically don’t hold a lot of water at a time, which is inconvenient if you’re growing a lot of plants

I personally like using a Battery Operated Liquid Transfer Pump to water the plants. You can pump water from a bigger container to your plants. This is a 3-gallon water container from Wal-Mart, and the pump just reaches the bottom.

My grow tent is 2 feet deep and this reaches the plants in the back. However, I don’t think the tube is long enough to reach the back if your space is deeper than that.

Some growers set up elaborate drip feeds to pump water if they have a lot of plants they can’t easily reach, both homemade or pre-made.

Let us know if there’s something we missed. Growers get creative!

How to Collect Runoff Water

It’s important to keep plants on saucers or trays so you can remove the runoff water. You can collect the saucers one by one and dump them out, but that also gets inconvenient with many plants.

It’s inconvenient to empty saucers one by one if you have a bunch of plants, but you don’t want to leave plants sitting in runoff water

If you put your plant on plastic trays, and then put the trays on a slight incline by putting something small underneath in the back, it will catch all the runoff water and cause it to drain to the front. The item in the back only needs to be about half an inch thick, for example a piece of plywood. However, if you can find something more water-resistant, like plastic, that’s even better.

These 1’x2′ plastic plant trays work well if they fit your space. You can fit four of them in a 2’x4′ grow tent (this is the grow tent I use) with up to two plants each as long as your plant containers are 11″ wide or smaller at the base.

Put trays on a slight incline by placing something underneath the tray in the back. This causes all the water to come to the front for easier collection. Each of these trays has a small plastic board (which we found around the house from something else) under the back. Anything that’s about half an inch high will do the trick. These particular trays accommodate plant containers up to 11″ wide at the base.

Not sure how to remove runoff water after watering your marijuana? Wet vacuums can be a great choice, especially if you already have one in the house. I didn’t have one, so I got Bucket Head attachment which can turn any standard 5-gallon bucket into a wet vac. You can buy one online but it’s $10-15 cheaper if you get it in person at a Home Depot. Another similar option is the Power Lid, though it’s also a bit pricey.

A downside to the Bucket Head is it’s a little loud, just like most wet vacs. Luckily you only need to use it for a few minutes after watering your plants!

Removing runoff water is a great start to make sure you are watering your cannabis plants perfectly, but it’s also important to…

Make Sure Pots Have Good Drainage

It’s very important to make sure that water can drain freely from the bottom of the pot, otherwise, the plant can get waterlogged and become overwatered (causing the plant to droop).

In addition to making sure the actual container has drainage (holes on the bottom, or some other way for extra water to escape), it’s also important to make sure your growing medium drains freely. If it takes several minutes for the water to come out the bottom of your pot when you water, it means that there isn’t enough drainage in the actual growing medium (it’s too dense, so water is having a hard time getting through).

How to improve the drainage of your growing medium

  • Never use dirt you find outside. Chances are it does not have the correct properties for vigorous cannabis growth.
  • Mix in extra perlite to loosen the soil and allow water to drain through more easily.
  • Bark or wood chips are not the best choice for growing cannabis plants, even though they’re sometimes recommended to improve drainage in soil for some types of plants. On that note, avoid using soil that contains bark or wood chips. What makes soil good or bad for growing cannabis?
  • Use Smart pots – these fabric pots help get oxygen to your roots (which gives you faster growth) and this type of pot makes it harder to overwater your plants. A cannabis plant growing in a tan fabric smart pot is pictured to the right.

This is an example of great soil for growing for cannabis – rich, composted, and well-draining

Composted super soil lets you grow organic marijuana without any extra fertilizers or nutrients

Watering Too Often? Barely at All?

In the beginning of your grow, you will likely be watering your marijuana plants every couple of days. Watering every 2-3 days is optimal for a young plant. If it’s taking too long for your plant to dry out, you may need to give less water at a time until the plant is growing faster.

If you feel like you are watering your plants too often, you may need to give more water at a time. You can also move plants into a bigger pot (which holds water for longer).

If plants take longer than 3-4 days to dry, make sure your potting mixture has good drainage and consider giving less water at a time

See also  How To Store Weed Seeds

If plants are drying out in 1 day or less, try giving more water at a time or transplanting to a bigger pot

Speaking of pot size, it is generally best to start young cannabis plants in relatively small containers (like a solo cup with a few holes cut out of the bottom for drainage), and move plants into bigger containers as they get bigger. Starting in smaller containers makes it a lot harder to overwater your plants when they’re young, and makes it easier to flush plants and/or respond to problems if they occur.

That being said, you can plant your seeds right into their final container. Just be careful not to overwater your seedlings at first if they’re in a big container as they’re not drinking much water in the beginning.

If you started your plants in a solo cup, I’d recommend moving to a bigger pot once the plant is a week or two old, as soon as the leaves reach the edges of the solo cup.

10-20% Extra Runoff Every Time You Water (if you’re providing nutrients in the water)

Every time you water your plants, make sure that you provide enough water to get about 10-20% extra run-off out the bottom of the container, especially if you’re feeding additional nutrients in the water.

Sometimes soil and soilless growing mediums like coco coir start to collect natural salts from fertilizers that never get washed out.

These built-up salts can eventually cause nutrient problems, pH problems, and nutrient lock-out if they’re not removed on a regular basis.

Making sure you keep adding water until you get run-off is also a great way to make sure that your plants are draining properly.

Plus, this practice will immediately alert you to any drainage problems, (as mentioned earlier, cannabis likes well-draining soil) because you’ll be able to notice if the water takes a long time to come out the bottom, or doesn’t come out at all.

Different Nutrients for Different Stages of Life

First, make sure you’re using proper cannabis nutrients for your growing medium. They should be formulated for a plant like tomatoes, and they should have a different feeding schedule for the Vegetative (Grow) and Flowering (Bloom) stage.

If using nutrients on a regular basis by adding them to your water, it’s generally a good idea to give your cannabis plants nutrients every watering. This ensures the amount of nutrients in the plant root zone is kept relatively stable. If you notice the tips of leaves getting burnt from nutrient burn, it may mean you need to lower your overall strength of nutrients. Most nutrient recommendations on the side of the bottle are too strong for cannabis plants, and should be cut in half unless plants appear pale or lime green (which means they want higher levels of nutrients overall).

If Growing in Composted or Amended Soil, Give Just Enough Water That the Soil is Wet All the Way Through

When growing in composted and amended soil, the soil itself is made to slowly provide nutrients to your plant throughout its life. However, if you’re regularly watering until you get a significant amount of runoff, you’ll also be washing away some of your nutrients.

This is good when the plant is getting the nutrients directly in the water, to avoid unwanted buildup in the soil, but try to avoid a lot of extra runoff if you want your nutrients in the container to last until harvest.

Therefore, when growing in amended soil you should only water until you get just a drop or two of water runoff out the bottom. You want to ensure you gave enough water to reach the bottom of the pot without letting a significant amount of water run out the bottom.

Proper watering practices will greatly help reduce the amount of salt buildup and prevent nutrition problems from occurring.

If your cannabis plants shows signs of drooping, often the plant is getting too much or too little water, but not always. Drooping can be caused by….

  • Too much water at a time, or giving water too often
  • Not enough water at a time, or giving water too infrequently
  • Drooping can also occur in hot conditions, or when it’s very humid or dry because the plant isn’t able to move water properly through the plant.
  • Plants sometimes get droopy if they are given a lot of water after being allowed to dry out for too long, due to the stress of the water pressure quickly changing at the roots.
  • Drooping is almost always associated with something going on at the roots, but plants also tend to put their leaves down a bit right before the lights go off, as if they’re preparing to “sleep” for the night. That can sometimes be mistaken as drooping when its actually part of the plant’s natural rhythm.

In order to prevent over or under-watering, make sure you water thoroughly every time (don’t just water a tiny spot in the middle of the pot unless you plant is very small for the container). You should be getting 10-20% extra runoff water every time if you’re adding nutrients in the water. In soil, wait to water again until the top inch of the growing medium feels dry, up to your first knuckle or so. In coco coir, aim to water the plants every 1-3 days if possible, and don’t let the top completely dry out between waterings.

Underwatered Marijuana Plants

  • Wilting is the first sign of underwaterd marijuana plants
  • Leaves are limp and lifeless, they may seem dry or even “crispy”
  • Will eventually lead to plant death if not corrected

Overwatered Marijuana Plants

  • Drooping / Curling is the first sign of overwaterd marijuana plants
  • Leaves are firm and curled down all the way from the stem to the leaf
  • Will eventually lead to leaf yellowing and other signs of nutrient problems if not corrected

If your plant is experiencing “the claw” and not just normal drooping (like the ends of leaves are just pointing down like talons, then you may actually have a nitrogen toxicity (too much nitrogen).

Nitrogen Toxicity (“The Claw,” tips bent down, dark leaves)
Learn more about Nitrogen Toxicity

Watering Weed
A Guide To Water your Marijuana Plants

But, when it comes to marijuana plants, the whole watering process requires a little more finesse.

Not to worry though! In this article, we will cover all the ins and outs of watering weed so you can run a smooth-flowing operation.

Don’t have time to read the guide right now?

No worries. Let me send you a copy so you can read it when it’s convenient for you. Just let me know where to send it (Takes only 5 seconds).

  • The importance of H2O
  • Types of water for watering weed plants
  • What is the right temperature to water your plants?
  • How often should you water your plants?
  • How much water do marijuana plants need?
  • The best method for watering weed
  • Why the right ph value is key
  • Watering weed in a nutshell

The importance of H2O

Cannabis plants, like most living things, consist largely out of water. Needless to say that maintaining that water balance is of vital importance.

Watering cannabis is a science in its own right. You will be dealing with meticulous PH values, various types of water as well as fluctuating needs during different life stages.

Overwatering could lead to nutrient deficiencies and diseases while providing too little water is often the reason for stunted growth.

It’s a delicate equilibrating that you need to maintain at all times in order to get that thriving crop every grower desires. Don’t let this discourage you though, we are here to walk you through how to water cannabis every step of the way.

Types of water for watering weed plants

We often don’t think about it, but water comes in different types and qualities. While some are perfect for watering pot plants, others might be ill-advised due to the water containing harmful substances or unwelcome minerals and bacteria.

pH and EC values are important factors when it comes to watering plants. Not only do these factors have a strong influence on your root development and the number of nutrients they can absorb, but they also play a vital part in the general health of your plants.

What you need to keep in mind is that these pivotal factors may strongly fluctuate, depending on the source you are getting your water comes from.

Let’s have a look at a few varieties and what makes them suitable (or not).

  • Tap water
  • Bottled water
  • Distilled water
  • Reverse osmosis water
  • Rainwater
  • Spring, reservoir, or well water
  • River water

Tap Water

By far the most frequently used source of water for watering weed. It’s cheap and widely accessible. But, there are a few things to take into consideration before you reach for your garden hose. Water has different degrees of hardness. We determine the hardness of water by the amount of calcium and magnesium in the water. These elements occur naturally in rocks such as lime and chalk and our groundwater. The more of these minerals in the water, the harder the water will be.

As such, tap water can be either soft (EC – 0.4), medium (EC + 0.4) or hard ( EC + 0.8). Also, tap water generally has a pH value of over 7.0 and often contains lime, chlorine, and fluoride in some cases, which can kill soil life and decrease its quality.

To make sure your tap water is in optimum condition for your plants, there are a few precautions you can take: let the water sit for about 24h so some minerals and other components can sink to the bottom of your watering can. You could also use an osmosis filter in order to filter your water.

See also  Can You Eat Weed Seeds

Bottled Mineral Water

Bottled water is perfect for people to drink. But, aside from becoming a costly affair, it might not be the best option for watering your cannabis plants. While mineral water does not contain any harmful substances, and its EC levels are lower than 0.5, with a pH around 7, it still contains high amounts of some minerals such as calcium, which may end up affecting your soil life and how your plant grows.

Distilled Water

Most supermarkets and convenience stores sell distilled water, but you can also quite easily create it at home, which makes it, even more, cost-efficient.

Distilled water doesn’t contain any minerals or any other type of microorganisms. This water is perfect for plants since you basically start with a blank slate. In order to use it on plants, the only thing you have to keep into consideration is that it usually has a pH value of over 7.0 and an EC (water hardness) of 0.0. We advise simply adjusting the pH value and adding some calcium and magnesium until it reaches 0.4 EC.

Reverse Osmosis Water

Reverse osmosis water is quite similar to distilled water, just not as pure, since it doesn’t remove all the minerals such as chlorine, lime, etc.) and impurities from the water.

Reverse Osmosis water arises by using a filter that traps the minerals and other unwanted particles.

You can make this type of water by simply using a decent osmosis filter and setting it up. Depending on the filter, osmosis filters tend to produce less than 0.4 EC and a pH value of about 7.0. This makes the water potable and safe to used to water your plants without needing to modify it further.

Rainwater

Rainwater sounds like the most logical option, as the water comes naturally from nature. Growers who use rainwater usually do this by using tanks that fill them with rainwater and then store it for later use.

Rainwater is one of the cleanest types of fresh water on the planet. It usually has a pH of 7.0 and an EC that does not exceed 0.4. This makes it suitable for watering almost any type of plant, as nature tends to automatically remove all harmful elements before the rain falls.

To get the highest quality rainwater, you need to set up a water collection system. Keep this as clean as possible to avoid the inclusion of elements that could reduce the quality of the water or contaminate it.

We advise you to also use an impurity filter and recommend using rainwater outside the cities. This because the rain that falls in the city contains traces of pollution because the air here often contains traces of smog or pollution.

Spring, well or reservoir water, etc.

I would honestly not recommend using water obtained from wells, springs, reservoirs, and other similar sources since you cannot be sure of its composition. A visit to the city waterboards might supply you with more information about its mineral and chemical content. This is highly important since there is a possibility that the water could be polluted with chemical insecticides or mineral fertilizer, which renders it useless for your plants. Also, these types of waters tend to contain large amounts of harmful fungi and bacteria.

In order to use this type of water, we recommend doing some serious research beforehand. If you should decide to go forward, make sure to treat the water accordingly and meticulously prepare your storage area to avoid fungi and bacteria from spreading. If you prefer to use water from your own well, you can drain it first and treat the surface using ultraviolet light or shock chlorination before use.

River Water

River water may sound like a great idea for watering weed, but I personally would advise against it. Aside from having to deal with a lot of similar issues of the previously mentioned well water, rivers are generally miles long and often polluted with pesticides or harmful substances by industrial areas or factories along the stream. Aside from that rivers can also contain dead animals that contaminate water during decomposition.

In order to use river water, you should probably live near somewhere where your town waterboard can assure you that the rivers don’t contain any sort of contamination which is, in all honesty, a long shot.

What is the right temperature to water your plants?

Aside from the pH and EC levels, the third most important factor is your water temperature. If there are wide fluctuations in temperature, this may lead to problems along the way. Water that’s too hot or cold will not be able to absorb certain nutrients.

When growing in soil the perfect temperature is between 20 and 23 °C, keeping in mind that the soil acts as a sort of wall between the inside and outside, which allows for slight variations in the temperature in your grow room and water.

By using a simple thermometer you ensure your plants get watered at the correct temperature.

There are a plethora of different water thermometers available, most of them pretty affordable. Some EC and pH meters can also measure water temperature accurately. Depending on the temperature, water can actually suffer certain changes in its composition, including oxygen levels.

How often should you water your plants?

How much water your plants need and when it is time to water, depends on various factors. One of them is the life phase of the plant. For instance, seedlings and clones have a much lower water requirement than vegetating and flowering plants.

Let’s look at the individual stages

    Germination: One of the basic things in seed cultivation is that you need to make sure to keep seeds damp but not wet. This generally means you need to water them once per day. Using a starter tray is a great option since the plastic cover works well to contain heat and moisture. Another solution to ensure the soil remains moist is to cover your container with plastic wrap.

How much water do marijuana plants need?

How much water your plants need depends on a number of factors, including:

  • Outside temperature
  • Stage of growth
  • Size of the plant

Larger plants will require more water than smaller plants. If you’re growing the plants outdoors, provide them with more water when the temperatures are up, and make sure to reduce the amount of water when the humidity level is high.

Water should pool up on the surface of the soil while you’re watering, but it shouldn’t sit on the surface after you move on to the next plant.

If a plant is very dry, water will run straight through the pot and quickly come out of the drainage holes. When this occurs, water the plant a little, move on to the next plant, and repeat after 10 minutes as necessary. This allows the soil to gradually absorb water incrementally until all of the soil is thoroughly wet.

As the plants’ lifecycle progresses, so will their need for water. You might want to provide some individual plants with additional water in between their main waterings as they grow.

Take notes and make calculations. Setting a cycle where the plant needs to be watered every two to three days is ideal. As you continue your growth you will eventually come up with the perfect watering schedule for your plants’ needs.

How to tell if you are underwatering cannabis

Wilting is the first sign your marijuana plants are in desperate need of some additional H20. The cannabis leaves drooping will seem limp and lifeless and, in worse cases dry or even crunchie. It is of the essence to take action now because this condition will inevitably kill your plants if not corrected at once.

How to tell if you are overwatering cannabis

Overwatered your cannabis plants can be just as harmful as underwatering them. Overwatered cannabis plants are droopy with leaves that curl down. As a result of overwatering, leaves often turn yellow or show other signs of nutrient deficiencies (Particularly younger plants and seedlings are very sensitive to this).

When your plants are showing signs of overwatering, this does not necessarily mean you need to give them less water but rather to adjust the frequency of watering and make sure your growing medium has proper drainage.

The best method for watering weed

Instead of watering your plants in small quantities multiple times, try giving them a less frequent but efficient soak.

A proper soak implies watering them to 25–33% of the pot’s capacity. This amount provides the root system with sufficient water to quench its thirst, without excess puddling and potential fungal issues.

When watering, you want to start in the middle first. After allowing the roots to breathe, continue watering the edges of the container too. This way the root ball also transports nutrients residing in the top of the medium down to the root system below.

This results in the correct amount of water minus the hassle of possible puddles. This is especially beneficial to avoid fungal pathogens that lead to root rot, which are often caused by excess water.

Besides creating holes at the bottom of your containers allowing the water to escape from, the containers should be lifted slightly off the ground, allowing the water to drain and plants won’t be left in puddles of moldy water.

Why the right pH value is key

When growing in soil, the pH range of your water should ideally have a pH value of between 5.8 and 6.5

See also  Best Soil For Marijuana Seeds

To test your water pH, you can a measuring stick or some pH measuring drops. If the pH is too high or too low, you need to adjust this. Using a few drops of pH up or pH down to reach the right level. This is especially important if you’re using tap water which generally has a higher pH.

If you do not have this ready-made formula at hand, don’t worry! There are other ways to get the desired ph level.

Lemon juice has high acidity and a pH between 2.0 and 3.0, so when you add a few drops to your water, this will certainly lower the pH. Appy, as needed until achieving the result you want.

Baking soda does exactly the opposite. This multifunctional substance, also known as sodium bicarbonate, is naturally alkaline and has a pH of 8. When adding baking soda to your water, you will raise both the pH value as well as the alkalinity.

A word of advice: If you’re adding cannabis nutrients to your water, measure your pH after each feed. This will provide you accurate information for future growths (make sure to add this data to your growth diary). And on top of that, it will tell you if you need to increase nutrition or modify the next dosage.

Watering weed in a nutshell

Well, sorry for this lengthy narrative, there is just so much to tell!

After going through the various different types of water you can use when growing cannabis, including some you may not have thought of, the best water for growing plants is clearly reverse osmosis or distilled water. These two types of water can guarantee that your plants aren’t getting any toxic minerals or anything they shouldn’t get unless you’re adding it to the water.

Make sure your soil never completely dries out and always, always check your PH values before watering weed. Hopefully, you will never feel like a fish out of water again when it’s time to water your marijuana plants 😉

How to water and flush marijuana plants

Like all plants, cannabis requires water in order to perform its basic functions. Water helps plants absorb nutrients from the soil and then moves up the plant and into the leaves, and without it, the plant can’t survive. But giving a marijuana plant the proper amount of water may be more difficult than you think.

There isn’t an exact science for watering a weed plant. You can’t observe the roots in most cases to see if they need water. Also, a plant is constantly growing and the climate it’s in will fluctuate, so the amount of water it needs constantly changes.

Here are some tried-and-true tips to keep your weed plants healthy and properly hydrated.

How often should you water marijuana plants?

A common mistake first-time growers make is to overwater marijuana plants. A cycle of wet and dry is healthy and necessary for the roots of a plant to grow out and reach deeper into the soil.

Additionally, roots pull in oxygen as soil dries and when soil is too wet, the plant can’t pull in oxygen efficiently and essentially can’t breathe.

Below are general estimates and are meant to give growers a rough sense of frequency of waterings; if a plant needs water and it falls outside of these ranges, water it.

Plant stage Water every # of days
Germination 4-7
Seedling 3-7
Vegetative 2-4
Flowering 2-3

How to tell if a cannabis plant needs watering

The best ways to tell if a weed plant needs water is to:

  • Stick a finger 1-2 inches into the soil—if it’s wet, hold off; if it’s dry, it’s time to water.
  • You can also pick up a pot and feel its weight to determine if it needs water. This will take some experience—be sure to lift up your pots after watering to get a feel for how heavy they are when full of water. This will also give you a sense of what a light, dry, plant feels like.

An under-watered marijuana plant looks droopy and weak, with yellow or brown leaves; there is no strength in the leaves and they look lifeless.

Leaves of an overwatered plant look slightly similar in that they droop, except the leaves will be dark green and the leaf tips will be curled.

Note how often you water plants and write it down in a log. Get your marijuana plants on a watering schedule—as they grow out of the seedling stage, watering every two to three days is ideal.

Keep in mind that as plants get bigger, they will need more water and need to be watered more frequently.

When growing weed outdoors, you’ll need to water more often as the weather gets hotter and less often as it cools.

When you find the sweet spot between too wet and too dry, your plants will flourish.

How much should you water marijuana plants?

The amount of water your marijuana plants need depends on a few factors:

  • Size of plant
  • Outside temperature
  • Overall health
  • Stage of growth

You want to water a plant enough to soak all the soil in the pot. Water should pool up on the surface of the soil when you’re watering, and come out the drainage holes in the bottom of the pot after a couple seconds. If water sits on the surface of the soil, that means it’s too wet and doesn’t need more water.

If a weed plant is very dry, water will run straight through the soil and pot and quickly come out the drainage holes. If this happens, water the plant a little bit and then come back to it after 15-20 minutes and water it again, and maybe even a third time. This allows the soil to slowly absorb water until all of it is thoroughly wet.

Roots are constantly on the hunt for water as they grow and stretch out. As a plant gets bigger, so should the watering radius—the area around the stalk of the plant that you water. Doing this will help guide roots to the edges of the pot as they seek available nutrients in soil.

Watering too far away from the roots can create standing water, which can lead to root rot, mold, and pest issues.

Is your container the right size?

To properly water a cannabis plant, it needs to be in the correct size container, or a big enough hole if it’s in the ground. If a pot is too big, the plant’s roots can’t drink water where they don’t reach. If the roots aren’t absorbing water, water will sit in soil and take a long time to evaporate, which can promote root rot and unwanted insects and fungus.

Conversely, if a container is too small, the roots won’t be able to stretch out, which can stunt the growth of a plant. Less soil also meant you’ll need to water the plant all the time, which will add labor.

Ideally, cannabis plants should start in a small pot and progress to bigger and bigger pots as they outgrow each container. For example, you can start a seedling or clone in a 4″ or 1-gallon pot, then move on to a 2-gallon, 5-gallon, 10-gallon, and so on.

Plants are ready to transplant when a healthy root structure encompasses most of the soil and the roots aren’t bound. When transplanting, take time to look at the quality of the roots: Bright white roots with a strong, thick structure is a sign plants are getting watered correctly.

What is flushing?

Flushing is an important part of the marijuana growing process, when you stop giving a marijuana plant nutrients and give it straight water. This is done to flush out nutrients that may have built up in a plant during its life.

Flushing is done for about a week before harvest, at the end of a plant’s flowering stage when buds are almost ready to cut down.

A flush can also be done to clear plants of nutrients if they have a nutrient imbalance, such as nutrient lockout, when your plants are overloaded with nutrients and unable to absorb new ones.

How to flush weed plants

Flushing marijuana plants before harvest

The final flush should occur for a week or so before you cut down weed plants for harvesting. Water your plants with the same amount as you normally would, but only with water. This will force the plant to use the nutrients stored within it—if its nutrient reserves are not used or broken down, it could affect the quality of your harvested buds.

By looking at the trichomes on marijuana plants, you’ll be able to tell when the plants are ready for a flush—begin when they start turning milky.

Different growing mediums require different flushing timeframes before harvest:

  • Soil: 7-10 days
  • Rockwool and coco: 7 days
  • Hydroponics: 5-7 days

If growing in amended organic soil, it is not recommended to flush plants. This is because the soil already holds all the nutrients the plant needs to thrive, and by flooding the soil you can wash away and damage the complex ecosystem that you’ve worked hard to develop.

When to stop watering before harvest

Water your marijuana plants as normal when in the flushing phase—don’t let them get too dry or too wet. Make sure not to harvest dry or wilting weed plants—they should be nice and healthy when you cut them down.

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