if your temps are ok, you could leave them outside. You want 18 hrs of light during veg, though, so you'll want to arrange some kind of lighting outside. When mine first sprouted and I learned about 18 hours of light, I jerry-rigged a CFL in one of my spot light holders and put it about 2" from the plants. Woefully inadequate, I know but it was all I had at the time. The next day I bought 3 more. Continued adding as I went along.