I buy bagged humus+cow manure from Lowes. They also have a finely chopped and about 50% rotted hardwood mulch. I usually mix the humus, mulch, and sandy garden soil in a wheelbarrow then dump it on top of the garden soil. I tilled it in by using a garden fork until I bought the mini tiller. Makes a loose fluffy mix which is ideal for peonies and irises.
