I only plant a few squash vines, consequently when they first start to bloom, I'm lucky if the flower gets pollinated. I have three crooknecks and one zucchini. Planted a couple other zucchinis but they didn't make it. Have direct planted some seed, but they are not up yet. Anyway, the smaller the planting, the less effective pollination will be, and some of the early fruit may not turn into mature squash. My first three or four squash did not set fruit, but they do seem to be setting fruit now.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.