During veg I feed superthrive every watering w/ or w/o ferts. 1-2 drops per quart or gallon, doesn't matter much you won't hurt your plant. Just has a few vitamins and hormones plants like. Also, you can feed it a heavier dose when you transplant to help prevent shock. I hear not to use it during flower tho.

As far as when to feed, about 2-3 weeks after you plants sprout, they should be about ready for food. Start off with 1/4 strength dose of whatever your fertilizer recommends and gradually work your way up. I personally used the FoxFarm organic nutrient 3-part system. The girls absolutely loved it, and if you look around the boards, lots of ppl use foxfarms, great company, great soil, great ferts.

You can pick up foxfarms nutes and soil from your local grow shop, or order it online from somwhere like www.wormsway.com or www.hydrowholesale.com

Check out their site: http://foxfarmfertilizer.com/productsfox.html

And that attached pic is the feeding chart for their system.

Hope that helps LM :rastasmoke: