Between planting and harvest, how much water does a marijuana plant need? How much water your cannabis plant needs is a very important question. One that we need to know the answer to, if we are venturing into growing. Read on to explore how much water your plant needs.

How Important is the Right Amount of Water for Cannabis Plants?

Just like humans, plants need water too. Marijuana, being a plant, needs water for its survival. To have healthy crops, you need to ensure that your marijuana has sufficient water throughout the growing period. You will need to make sure that you keep a watering schedule until you harvest your plants.


So watering all the time is good right? Once a day, just soak the soil and your plant will be fine? No. This is not true either. Too much water can cause serious damage to your cannabis plants. You want to strike a balance with watering your cannabis plants; neither too much nor too little. Too much water will cause a condition known as root rot.

Striking a balance with the amount of water your marijuana plants need to thrive is the first step towards securing a better yield. You want to find this balance to ensure healthy plants.

How Much Water Does a Cannabis Plant Need?

I wish I could sit down and write out a list for you. The list would say that this strain of weed needs THIS amount of water, every two days. This strain of weed needs THIS amount of water, every three days. I wish it were that easy. Unfortunately, it is not that easy. There are many factors that go into how much water your cannabis plants need.


Where you live will affect the amount of water that your plants get. If you live in Death Valley in the United States, your marijuana will need more water than if you lived in the northern regions of Finland. The relative heat, humidity levels, and sunlight in your area will affect the watering schedule of your cannabis plants.
If you are growing indoors, you have more control over these elements, so that is an upside.


The Stage of Growth

How old your cannabis plants are will also affect the amount of water they need. A cannabis seed under the soil needs less water than a fully grown plant. The smaller seedling does not have the mass that a fully grown, potentially 6 foot, plant has. Because of this, it needs less water.

A sprouting plant needs more water than a seed, but less than an adult plant. Again, there are size issues at play here. At certain stages of growth, the plant will require more or less water than it did the day before.

So how can you tell if your plant needs more water or less water? Well, there are a couple of ways to figure this out.


How Do I Know If My Marijuana Plant Needs Water?

Your plant will most likely tell you if it really needs water. A cannabis plant that is starved for water will begin to sag and droop. This is your plant's way of telling you that it is in need of water. Water your plant immediately if you see it like this.

A plant where the leaves have turned yellowish or brown may have root rot. Root rot is when you have watered your plant too much and its roots have begun to rot. Plants in pots without sufficient drainage are more susceptible to root rot. A plant with good drainage is much more likely to not develop it.

So how do you know, on a normal day, if your plants need water? Well, you can stick your finger about 5cm (or about 1-2 inches) under the surface of the soil. If the soil is dry, the plants need water.


If you leave your plant too long without water, you will lose your plant. The same is true if you overwater your plant. Keep this in mind as you set up a regimen to water your plants. If you are very organized, you can keep detailed notes. You can learn from these and apply the notes to later growth. But keep in mind, they form a guideline, not rules. Always watch your plant for what it is doing in order to have the best idea for when to water.

How Often Should You Water Your Cannabis Plants?

Along with what we said earlier, how often you should water your marijuana plants does not imply that there is a definite number of days. There are multiple factors at play here. Let’s look at a few factors that determine how often you should water your cannabis plants.


If you grow your weed directly in soil, you will have to monitor how your soil behaves. If the soil is dries out quickly, it means you will need to water the plants more often. If the soil remains damp longer then 3-4 days, you will need to look at if the soil is too compact. You may also want to make sure that it is draining properly. Do not let the soil get too dry. You want to make sure there is consistency in your watering.


If you grow your marijuana in pots, it is easier to keep an eye on the dryness of the soil. You can get into the pots and see how the soil is doing. Also you control when they are watered, so there is less likely to be a chance that they will be over-watered – if you are being conscientious.
Some pots are breathable and allow moisture to evaporate out of the sides. I am thinking about terracotta pots and unglazed clay pots. Other pots will trap moisture in. This can happen with plastic pots. Watch your soil to make sure it isn’t too wet or too dry.
Never wait for the soil to get dry to water your weed. I think it goes without saying that if the top of the soil is still wet, you do not need to water the plants.

Plant pot

Super Soil

Super soil is a potting mix with organic nutrients added to the soil. You will need to water your cannabis grown in this soil on a regular basis at the beginning. It could require watering up to 3-4 times a week in the beginning. As it gets older it will require less water. Be careful about over-watering, as you do not want to wash away the added nutrients.

How to Water Your Marijuana

There are a few different ways to water your marijuana plants, depending upon how big your grow is, and where you are growing. If you are just starting out with growing marijuana, chances are you will only be growing up to a few plants. If you only have a few plants, the ideal tool for watering your cannabis is a watering can. A watering can allow you to water the soil and then the leaves – if they are out of direct sunlight.

Water can

However, a watering can has its drawbacks. You may need to fill it multiple times depending on how many plants you have. Also, the amount of water you need goes up as the plant gets older. It is still a good way to start watering your plants.

Using a liquid transfer pump that operates on a battery is another good way to water your crops. This is better, and faster, compared to a mechanical watering can. Unlike the watering can, a liquid transfer pump can reach the leaves and the bottom of your cannabis plants; while you stand at a distance.

If you are a large-scale cannabis grower, you can opt for an electric pump. An electric pump allows you to water your crops from a distance. Besides, some modern pumps do not need a human operator to be present.


So, how much water does cannabis plant need? There is no exact answer to how much a cannabis plant needs. If you are contemplating growing your own plants, whether one or a hundred, you need to have a plan in place to water the crops regularly. It is better to start small and gain experience with watering your crop. Then as you gain experience with growing and watering, you can expand your garden. Otherwise, plants are just like people they need the right amount of water to survive.