what kind of light are you using? If it is HPS, do you have glass cover on your reflector?
18 inches to grow and bud a plant... wow... that's tight... that will be a full time job... you will need to check your plants at least twice a day if you are using hps... plants can grow several inches very very quickly.... you'll need to train... train... train..

send pics if you decide to pull this off... we'd love to see this experiment : )
good luck
Garden Knowm Reviewed by Garden Knowm on . Flowering Height Question? Hi, I'm just about to start my first grow :) but I've got a really small space and wondering what is the smallest height I can bring my plant into flower with, and what size can I expect it to be when it's at a stage for reaping whatever rewards. I know it's a little hard to answer as I can't tell you what seed it is (bag seed for a first grow). In the box I have there's about 1.5' room for the plant to grow up. Another thing I've been thinking of is putting my light at the side of Rating: 5