Re use Dirt! :O

these people at this link has made soil out of just leaves and grass cutting http://compost-twin.com/home.asp

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DO NOT USE SOIL FROM YOUR YOUR YARD. YOU WILL JUST BE ASKING FOR TROUBLE. The dirt will be full of disease and bugs. Growing good weed is hard enough. Dont make it harder by bringing nasty things into the garden. You will also have problems with drainage. Sure weed grows fine in the soil when you plant it outside but thats fine because of the balance of nature. When you grow indoors you are nature. You have to give everything. Food light water wind and now you will need a army of predator bugs to fight all the nasties you unwittingly brought in with your dirt. Its your grow so do what you want but just take a sec and see what just everyone is doing. Im sure you wont find many growing indoors with yard dirt. My advice would be to not use any kind of potting soil as they are all full af crap. Go with a good grow medium like sunshine mix #1 or #4.

http://www.sungro.com/products_displayProProduct.php?product_id=1&brand_id=1

Good luck.