Zucchini blooms not opening
I have always had gardens and never had problems until two seasons ago. My zucchini just won't produce. I have between 10-20 plants each season in raised beds, and I'm lucky if I get 20 fruit. The foliage grows normally, but it appears the blossoms (both male and female) aren't opening, so the plant doesn't get polinated and aborts the fruit. Last year I tried to hand pollinate, but it didn't seem to do any good. I've tried manually opening the blossoms, but still nothing. I don't think bees are to blame, because I get bumper crops of tomatoes, tomatillos, boysenberries, beans, etc. I've rotated the crop locations each year, supplementing the soil with new potting soil, and wonder if the soil is too rich in something. Any ideas?