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G brings up using manure. I bag my grass clippings beginning about half way thru the summer using the big contractor bags from Menards. When as full as I want the bag I shoot in about a gallon of water and tie the bag shut. These get set along side the garden where the sun can hit them. After the fall tilling I stack these bags right on the garden. Come spring I open them up and spread the contents across the garden and till it in. Looks like manure, smells like cow manure right off a barn pile, but it doesn’t have the weed seeds and corn/oats that cow/horse manure can have.
When the plants in the garden are still small I will spread my grass clippings between the rows of veggies. It helps keep weeding to a minimum and creates a semi-clean walk way between the rows.
Fall leaves get mowed up and bagged along with a shot of water too, and will go on just before spring tilling.
Our soil was terrible until I began a regimen of adding lots of organics back into the ground. Now we have great garden soil.