Compost heap! All you do is dump all your green waste (lawn cutting, drop leaf, what ever organic material) and kitchen waste on a more shady spot in your garden. Rest the micro organisms will do and you end up with very good black soil. Is a bit to fine to use directly, might suffocate your young roots, mix it with Perlite and you have already a awesome medium to plant. Perlite costs a little, the soil is free..
Cycle is about 6 months.. what ever you drop on top, comes out as soil further down around 6 months later. Needs to kept moist to work.