Zucchini fruits, then withers (cross posted on Vegetable forum)
I had this happen last year too with zucchini and winter squash: the plants have good growth, good flowers, look very healthy, then when they fruit, the fruits don't grow much and then they eventually wither and die. It's a second-year organic garden with lots of good compost. They are watered regularly.
One concern I have: there are lots of walnut leaves in the compost and I used the leaves as mulch over the winter. Any cause for concern re: toxins from the walnut leaves? I have conflicting info about using them.