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Old August 15, 2018   #26
Cole_Robbie
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Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,305
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My beds are just mounds of good black dirt over the hard native clay. Although not the favorite of gardeners, clay has the advantage of being better at holding both water and nutrients. The looser a soil, the faster the fertilizer washes away, sand would be the worst offender, and nitrogen is the first nutrient to run off with the rain. By using clay as the bottom of my beds, that catches the good stuff and holds it longer, I think, before the rains wash it away.
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