when do i turn to flower/bloom

[boon]

my plants have been in soil for 3 weeks and are about 16 - 18 inches high and 14 inches wide. when should i turn to 12/12 lighting? or should i do it now

boon Reviewed by boon on 10-19-2007. when do i turn to flower/bloom my plants have been in soil for 3 weeks and are about 16 - 18 inches high and 14 inches wide. when should i turn to 12/12 lighting? or should i do it now Rating: 5

[mikeyjo]

Most wait somewhere between 4-8 weeks of veg waiting for at least 5 nodes to form (or until nodes start to alternate). Do the plants have any preflowers showing?

[FireTheft]

that's some sick growth for 3 weeks.....

most important thing for you to consider right now is your grow space. remember during flowering you plant will continue to grow in height and width for the first part of flowering.
if you don't have the light to accomodate the lower portion of your canopy it will essentially be wasted and wont' reach max potential. plants can grow anywhere from 1/3 to 1/2 their veg height during flower.

you can switch to 12/12 anytime. it is best to wait until preflowers show but its not necessary. 4-8 like mikeyjo said is the average time people do it.

but again, i think your most important issues you need to look at is your light amount, and your grow space size....(ventilation too)

[boon]

they are showing small hairs.
ive got 1 600watt hps light on at the moment but gonna add another.
ive been told to switch my outlet on after 2 weeks bloom