Even Mel says that vermiculite is gods gift to soil ammendment. but have you seen the price of this stuff? well here is the solution, visit your local swimming pool supply you can buy a giant bag of the stuff for about 15.00. They use it as fill when they install in ground pools. I not only mix it with my soil but i also use it to cover my newly planted seedlings both in the greenhouse and in the garden (It makes it so much easier for those little guys to push through once they germinate.but be careful at first as it is very fine and lite and if the wind ias blowing don't attempt to apply it without safety glasses. After application you should initialy water it with a spray bottle.