This might be common knowledge for some of you, but since not everyone knows this, I thought I'd share.
After the harvest season is complete and your garden becoming barren, you might want to consider tilling. While tilling at the season's end won't loosen the soil for you to plant the following season, it can help with the the decomposition of organic materials and also weeds and insects. Tilling just before a frost, while the ground is still workable, can expose roots to perennial weeds which lessens their survival chance through the winter. The same benefit happens from exposing bug larvae to the harsher winter elements.
For more information on autumn (or winter, depending on where you live!) tilling benefits, check out this informative article. It's an older article, but still useful.
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