My parents always did the dead-fish-in-the-bottom-of-the-hole trick for their New Yorkers and Early Girls. Was gross, but sure worked swell!
I'm betting their holes were closer to a foot deep, not 18" or many more mucho feet.
We once had a tomato seedling - a volunteer - that took root in the apron of our driveway, where the blacktop hits the cement garage floor. The "soil" it grew in was about 1/2" of dust or powder. So much for soil prep............. 8)
=gregg=
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