Many times we pay little or no attention to our garden soil. We spend good dollars on plant material but neglect to feed our soil. It has been said that it is better to put a $0.10 plant in a $0.25 hole then a $0.25 plant in a $0.10 hole.
In Nova Scotia our soil is basically clay(hard when dry & muck when wet)sandy and sour(needing lime, I prefer powdered or pelleted, faster acting) The remedy for both clay soil and sandy soil is the same.
Build up the soil with compost or any organic matter that will rot. I love to go to the beach and get Sea Manure. It washes up on the beach and so far, is free for the taking. Gypsum is a good additive to loosen clay-like particles in the soil. The deeper you can work up or rotar-til the soil the better.
Do not take a chance on last years preparation to be good for this year. Once you basically get your soil to the workable stage you are comfortable with, and it will take years, yearly maintenance will be sufficient. Another reason to keep your garden soil in good condition as earth worms are very beneficial to the soil an aeration of the soil and worms will not live in poor soil.