Ask-a-Dave's-Gardener: Veggie leaves turned brown and moldy looking?, 2 by Nickm62388

Nickm62388 wrote:
I tried to grow zucchini, tomatoes, and cucumber pickles and none of them grew anything. I watered routinely and as you can see in the pictures half the leaves turned brown/moldy looking? You can see in the one picture the yellow flowers on the ground which Look nice but then the brown moldy leave in the pot. What does the brown moldy leaves mean? Nothing came about they would sprout during day and I would get excited but nothing ever grew, just brown leaves on half of them?