You're going to want an organic rich medium that will support plant growth. Firstly, find out what mean green might do to a plant, some things are dangerous , even in trace amounts.
So, back to the soil. You're gonna want 50-80 percent organic material (compost, composted manure, etc) and then fillers like perlite and or sand and or peat moss for drainage/ water absorption purposes. I like to add native soil in some proportion, so as to make it truly native. Besides theres trace minerals and bacteria that benefit plants in any healthy soil. SO find some organic material and add some other stuff, and a little bit of lime to buffer.
You can grow 4 medium plants in that. Keep in mind you might get males.
Dispose of you're chemicals legally and safely.