Answer: I wouldn't recommend scraping clean with heavy equipment as that will compact the soil, which is not a good thing, especially with heavy clay. Plant roots need an aerated soil to be able to move easily through it. Tilling in leftover vegetable and flower plants would be okay, but I definately wouldn't plow under the weeds, as they produce jillions of seeds which will haunt gardeners for a long time! You're correct that adding organic matter regularly will improve the soil. The best thing would be to compost plant material and add that to the soil. Good luck!
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