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Scared of over watering or under-watering you plants? Can’t figure out what ingredients to give them? In this guide we’re going to go over the best ways to water your plants at the different stages. Here’s what we’re going to cover:
The amount of water to give to your plan depends on how much soil you have. In general you give about a quarter of the volume of soil you have. Here are some of the most common sizes used:
Your should see about 20% run off in your tray, that water will be sucked back up in the next hours.
The short answer is between 6 and 7. The sweat zone being around 6.5. You wouldn’t think so but the pH of your water is actually one of the most important things. Marijuana can only take in certains elements at certains pH’s, this is why you really have to be careful, and a trustworthy pH tester is your closest friend.
Here’s a graphique showing the important nutrients and what pH level the roots will be able to take them in at
It’s important to note that if you decide to go into the lower levels of humidity you’ll need to keep them well hydrated, or else this will be lived as a huge stress.
In any case you go for, as with the temperature you should aim for steady relative humidity levels.
If you decide to reduce or increase the humidity levels you should do so gradually
| Minimum pH | Maximum pH | |
| Nitrogen (N) | 5.5 | 7.5+ |
| Phosphorus (P) | 6.2 | 7.2 |
| Potassium (K) | 5.4 | 7.5+ |
| Ca (Calcium) | 6.5 | 7.5+ |
| Magnesium (Mg) | 5.8 | 7.2 |
| Sulfur (S) | 5.4 | 7.5+ |
| Copper (Cu) | – 5.0 | 7.1 |
| Iron (Fe) | – 5.0 | 7.1 |
| Manganese (Mn) | – 5.0 | 7.5+ |
| Molybdenum (Mo) | 5.8 | 7.5+ |
| Zinc (Zn) | – 5.0 | 7.1 |
You really just need to focus on the 3 first nutrients (N,P,K), but by your pH between 6 and 7 you’re sure that she can take in all the elements needed.
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Electro-Conductivity is a measure that allows you to get the levels of salts (nutrients) within your watering solution and your soil.
As a grower this can be super useful to make sure you have enough nutrients within your soil, that your plant can intake them, that you haven’t saturated your soil (and need to flush it)
You can measure the EC levels with an EC pen, which is very similar to a pH pen.
| Stage of life | HYDROPONIC | SOIL | ||
|---|---|---|---|---|
| PPM | EC (mS/cm2) | PPM | EC (mS/cm2) | |
| Early Growth | 350 – 400 ppm | 0,7 – 0,8 | 400 – 500 ppm | 0,8 – 1 |
| Seedling | 400 – 500 ppm | 1 – 1,2 | 500 – 600 ppm | 1 – 1,3 |
| Transition | 550 – 650 ppm | 1,3 – 1,5 | 600 – 750 ppm | 1,2 – 1,5 |
| Vegetative Stage | 650 – 750 ppm | 1,6 – 1,7 | 800 – 850 ppm | 1,6 – 1,7 |
| Vegetative Stage | 750 – 800 ppm | 1,7 – 1,8 | 850 – 900 ppm | 1,7 – 1,8 |
| Vegetative Stage | 850 – 900 ppm | 1,8 – 1,9 | 900 – 950 ppm | 1,8 – 1,9 |
| Flowering Stage | 900 – 950 ppm | 1,9 – 2 | 950 – 1000 ppm | 1,9 – 2 |
| Flowering Stage | 950 – 1050 ppm | 2 – 2,2 | 1000 – 1050 ppm | 2 – 2,1 |
| Flowering Stage | 1050 – 1100 ppm | 2,2 – 2,3 | 1050 – 1100 ppm | 2,1 – 2,2 |
| Flowering Stage | 1100 – 1150 ppm | 2,3 – 2,4 | 1100 – 1150 ppm | 2,2 – 2,3 |
| Flushing | 0 – 400 ppm | 0 – 0,8 | 0 – 400 ppm | 0 – 0,8 |
So, what nutrient does your plant need during her vegetative stage. The amount per Liter really depends on her size, but here’s what I’ve been doing
That’s really all you need to give her during the vegetative stage.
During the flowering stage your marijuana plant hardly takes in anymore Nitrogen, but her intake of Phosphorus (P) and Potassium (K), thus your mix should adapt with it. You can also stop giving it root booster at the end of the stretch, they won’t be growing much more from now on. So to recap, you’re going to need to:
At the start of the flowering stage I was giving about 5ml of Flowering mix for every 2L, but I was going pretty low, new turn I’m going to increase that level a little bit
Alright folks that’s all for this one!
Until next time, be safe and grow easy 😉
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