If you are using a garden fork to improve drainage you should also be doing this in the summer when the ground is dry. You will need a very sturdy fork as the best method is to drive it into the ground, then give a really good push and pull on the handle. This widens the holes and also cause lateral cracks in the soil structure vastly improving drainage and aeration. Personally, I prefere not to use any sand unless the holes are unsightly.
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