I sow directly in ground, but it's not great soil, so probably 6-10 inches below ground, the soil starts to get crap fast... lots of clay and rocks. Hard to bui

I sow directly in ground, but it's not great soil, so probably 6-10 inches below ground, the soil starts to get crap fast... lots of clay and rocks. Hard to build up good deep soil. That, plus lack of proper nutrients (sun, rain, minerals) led my corn to be thin and short, and they quickly topple over from the beans. You can still string them up of course, but it's annoying, and the corn ears are small and sometimes under-developed. The squash also didn't seem to fare well.