How to Water Cannabis Plants | Hints & Tips

Many growers around the world have questions regarding how to water cannabis plants. Many different theories are flying around, such as measuring how dry the top of the soil is to know if you need to water. This is absolutely not true! The upper parts of the flowerpot are much more likely to dry out than the lower parts; if you water by how dry the top is you might end up soaking the lower part of the flowerpot and drowning out your plants’ roots before they have enough time to absorb anything being given to them.

How to Water Cannabis Plants

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You need to adapt to your plants needs at all times, watering moderately while following your plants’ signs; a plant that has just germinated isn’t going to need the same amount of water as a plant that’s barely a month old.

The first thing you should do before watering is make sure that your plants have absorbed everything from last time; if it’s still humid, you don’t need to water any more. This can be quite the job if you have lots of plants, but if not done right you’ll end up with short plants that don’t grow much, and it some cases they may even begin yellowing and dying off.

How to Water Cannabis Plants Indoors | Step by Step

the best ways to water weed plantsThe first step is germinating cannabis seeds using the Tupperware system designed to germinate marijuana seeds easily, which we’ve explained here. This method practically guarantees germination, and if you use any other type of method to pop your seeds we simply can’t guarantee that you’ll obtain the desired results. Once the seeds have germinated, we like to grow by training the roots to go out in search for water, making them healthy and strong. In order to do so, you’ll need to follow theese steps:

  • Once your seeds have popped their roots out, you need to place them in a small 7x7cm pot about 5/10mm in, with the root facing downward. These pots must be full of substrate and watered first. Do not water again until the sapling has sprung up and until the pot weighs practically nothing.
  • Once the plant has stopped stretching upwards, you’ll need to move it to a 3L flowerpot. Depending on the substrate, you should usually water your new pot using more or less half a liter of water depending on the substrate used. Make sure to lift the flowerpot up every day until it’s as light as possible – this means that it’s almost entirely dry. That’s when you need to start training it.
  • Start off by using about a glass of water per flowerpot. If it’s accumulating after 3 days and your plant isn’t drinking it up, do not water again until the flowerpot is much lighter; even if your other plants are ready to be watered, make sure to work individually with each one. Once it drinks it up, keep up with the glass of water method.
  • Once you start noticing that one glass of water isn’t enough, start using two. If the water accumulates, don’t water until it’s all absorbed; make sure to check each pot individually and act accordingly for the best results. Once your plants stop growing, it’ll be time to transplant them. You should have a plant that has a decent root mass, and can easily deal with transplants to the ground or a 7L flowerpot.
  • When transplanting to 7L we tend to water with 1L, as it dries out easier. I usually water using a little more each day, testing the weight of the flowerpots as I go. Do not water just because it’s dry on the top; most roots are in the bottom of the flowerpot and go downwards; there aren’t many roots that grow upwards towards the drier layers. This is when you should flip to flower indoors. After about a week/10 days in this new flowerpot, training your plants to drink more water, it’ll be pretty hard to hurt their roots; this training method causes them to grow strong and sturdy, drinking pretty much all of the water they’re given.

How to Water Cannabis Plants Outdoors

When growing cannabis outdoors, if you notice that your soil isn’t drying and you keep on watering it, your plants will end up showing symptoms of drought! This is because all of the extra water has soaked the roots and burnt the parts that absorb water, essentially choking the roots to death. In order to help your plants recover from this, you need to let the soil dry out entirely, and then start watering little by little using a product designed for healthy roots; as Hesi’s Root Complex for minerals or Bio-Rhizotonic if you’re using organic nutrients.

The Best Way to Water Weed Plants

An important thing to keep in mind when watering cannabis is the start and end of their life cycle; if you water them too much at the start, you can outright kill your plants off. However,  if you water them too much towards the end, you may end up with soaked soil when it’s time to harvest. This means you’ll need to wait, which can also be conducive for fungi and rot. We highly recommend being cautious when watering during these two periods. Always listen to your plants; they’ll let you know when they’re ready to harvest, when they need water and when they have too much water. If you keep watering and expecting them to absorb it all, it’s not going to work out too well for you.

Remember to water sparingly; adjust the pH in your water and your plants should be healthy and strong.

This is a compilation of some of our personal tips and tricks; drop a comment below if you have your own tips or if you have another method to add! We’re always open to hearing new opinions and methods. Make sure to let us know if you follow these tips and if you get the results you were looking for!

Author: Javier Chinesta

Translated by: Ciara Murphy

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