time

hi, how long does it take form cutting to harvest?
is it truth, that after clones have sproud through rockwool I can switch to 12/12?
if it isnt, how long do I need to veg?
Im growing Norther Lights ard White Russian
thanks.

Vegetative time is directly linked to your time and space restrictions. You can go 12/12 from seed and harvest a few grams if you're lucky, or you can veg for longer periods to obtain a bigger plant, thus a bigger harvest. The veg stage is totally up to the grower, although the plants will eventually mature and want to flower. This can be prevented by never switching to 12/12 light schedule, or just constantly taking clones and forcing the plant to continue vegging.

Ledhed said:

You can go 12/12 from seed and harvest a few grams if you're lucky,

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That depends on the strain. There are 100% sativas where if you do not start at 12/12 you will run out of growing height and adequate lighting if growing indoors and you will get more than just a few grams from them.

generally when speaking of 12/12 from clone your packing many in to the small space SOG style. Otherwise you need to veg it like any seedling.