The soil came with it.

Scott's Potting Soil
http://www.scotts.com/index.cfm/even...16acd8a50738d4

but on the bottom part of the bag it says with root stimulant and it seems to be working great.
Da1KrayzieThug Reviewed by Da1KrayzieThug on . Day 19 :) yay Theyre under 5600 lumens. 2x42W CFL (150W equivalent). P.S. The soil with root stimulant made em grow like crazy. Rating: 5