I think the best way to determine when to water plants is by the weight of the pot. Get a good feel for the weight of the pot when it’s full of your dry soil mix.
It should feel really light. Use a scale if you have to.
You’re going to want to know this weight later, so either make a careful mental note of how the pot feels dry or weigh it and mark it down where you’ll have it at hand.
Water your dry soil mix until the water starts coming out of the drainage holes in the bottom of the pot.
Pour the water in slowly mixing it as you go allowing it to be absorbed by the soil mix for the most accurate reading.
Remember how much water it took (really important) and get a good feel for the weight of your pot after it’s watered.
For example, I use 6-gallon pots and it takes from 1 to 1-1/2 gallons of water for each plant every time I water.
Water is heavy, about 8.8 pounds per gallon, so you’ll feel the weight of the water. You’ll know when to water again when you feel that the pot is much lighter, but don’t let it get as light as the pot was when it was new and dry.
If you want to when you’re starting out, you could even keep a pot with just dry mix and use that to compare to the weight of your plants. You don’t want them to get that light.
Pot plants are pretty hardy and can overcome getting too dry, but you still have to pay attention to watering.
If they get overly dry, you’ll notice your leaves drooping, and the pot will feel really light when this is happening.
Water immediately with the usual amount of water and the plants will perk up soon.
They seem to recover without a problem, but in my opinion, letting your plants dry out to the point of drooping hurts your overall yield, as the plants’ growth will be stunted for a short while recovering.
The leaves will also droop if you over-water, and you’ll notice this has happened if/when they droop soon after watering.
In this case, you have to get rid of that excess moisture or risk rotting your root system and killing your plant.
If you run into this problem: Place the over-watered plant in a room in front of a fan.
Keep rotating the pot as the fan blows air over it. If it’s the summer, take the plant outside and watch it closely, as it will dry pretty fast.
One of these methods should work for you, and you have to address it quickly or you’ll lose the plant.
Water is a crucial element when growing, and this is where many new growers get it wrong. Too much or too little water can destroy your plants in a very short time.
I also want about 45% humidity in the grow room (my worst problem-its super low). You can also use a humidifier but keep in mind of the extra electrical draw you’ll have on your circuits.
Note about humidity: it can be a double edge sword. In all reality, I think weed plants would be better with around a 75% humidity level.
However, when you’re growing inside in a small room, mold can be a problem with a humidity level that high.
Thus, I’ll give up on high humidity to help prevent mold from growing. I still have awesome plants and buds with a humidity level of 20%.
One other thing while I’m thinking about it; best practice in weed growing is sometimes hard to achieve. For instance, my humidity level; even though I’m not, in this example following best practice, I still have awesome plants and the buds are great so never be discouraged if your room or equipment is lacking in one regard or another.
More Training and Resources
We will be continually adding training modules to the Bronze Membership Hub.
If you have suggestions for training please use our contact page and send us your suggestions.