Yeah what he said...

Plus room temperature and the plants age...
A large plant drinks a lot more water than a small plant.

a pump on a timer is the way to go..

: )
Garden Knowm Reviewed by Garden Knowm on . Flood + Drain how many times? Just a quick question. I'm looking to grow 2 plants under a 250w HPS light using flood and drain. I am debatinging whether or not to set up a automatic pump system or just flood and drain manually. How many times a day do you have to flood and drain for just two plant? Is it easier and best to set up a pump? Cheers Rating: 5