Zucchini huh?
Back a couple of weeks ago, June 16 to be exact, in response to your question on clay soils, I suggested you plant some cow peas in your garden to add tons of organic matter to your soil and begin building a super soil.
I kind of figured you would ignore my friendly suggestion, but being from Missouri myself originally, I did it myself to demonstrate cycles of plant, shred, and regrow to build soil and turn hard clay into great garden soil.
On June 16, a 75 ft row of first-generation peas were shredded and then allowed to reseed. Way less than $5 worth of seeds used on the first generation. Here they are today, a mere two weeks later and generating huge amounts of organic matter.
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Note: see all that organic matter in the above picture which is working on soil building
Soon they will mature the second generation of peas (for free) and again I will shred them and allow them to reseed a third generation of peas (again for free). Tremendous soil building at work. I will probably eat a bunch of the third generation of peas because I want this space for winter garden.... but I'll be sure to post up what might have been had you followed my suggestion to you to plant some soil building peas. Enjoy the squash.