it depends, i would wait until the plant is about 60cm tall, but you can leave it for less or more time, the longer you have it on 24 hour light, the more bud you will get at the end of it.
90713 Reviewed by 90713 on . How Long to Grow?-First Timmer This is my first attempt to grow and Iam using a feminisied White Widow seed. After 2 .5 weeks the wee girl is about 4 inchs tall and starting to produce 2 new leaves from the stem nearly every day. Iam growing in a box with 4x20W flours which are mounted in a 2 foot x 2 foot refelector box. This is the sort of lights you see built into the ceilings in office blocks. At the minute they are on 24 hours. How long do I grow for before switching to 12/12 for flowering and approx how long does this Rating: 5