Leaves generally do best if applied during fall so they can begin breaking down during the cold months. A walk behind tiller will have trouble turning under leaves at 4-5 inches. You might consider tilling before spreading leaves. This will allow better tine penetration.
I spread many tons of leaves during the fall. Some are turned under with a small mid-mount Honda. The larger areas are worked with a PTO driven tractor mount.
Whatever you use don't scrimp on the leaves. They will break down eventually even if you aren't able to completely till in. There is nothing better for your garden, the more the better.
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