Quote Originally Posted by Kcin982
ok he moved them to bigger pots he said, they were in peat pots and he checked the ph and it was neutral and he started misting the leaves once a day, how much should he water a 3 week old plant?
Best way is to check the weight of the pots. If they feel heavy and water-logged, don't need to water. If they feel light (like a pot with only soil and no water would feel), then they should be watered.

If your friend has a chance to check up on them regularly, he can give them a watering and wait a few days, checking the pot weight frequently, and waiting until the leaves get a little droopy, actually more wilted (sign of under-watering. If they are over-watered they will be droopy and curled). This way he will know what the pot should feel like before watering.

Depending on lighting, humidity, temperatures, soil type and composition, he might need to water every 3-4 days, maybe every 5-7 days. Watering everyday is not recommended. Cannabis likes wet/dry cycles.