Thats about where mine end up after veg, 20 inches. I grow in soil,, foxfarm ocean forest and run all there nutes thru out my grows feeding EVERY watering and yield about 5 to 6 oz per girl depending on strain.My chemos throw more than the white widow so it will depend on what ya grow. I can tell ya this, you will have a hard time getting a widow to hit 20 inches in veg without vegging for a month or better.
I run a 1000 hps for bloom and veg under a 600 hps. I veg for 1 month. Thats from takeing the cutting to hitting the bloomroom, so more like a 3 week veg cuz me clones all root in 7 days.
Strain dependent,, you'll pull from 3 to 6 zips per plant in soil and Hydro wont do much better.
