Preventing Blossom End Rot on Zucchini
Blossom end rot affects the fruit of squash, melon, and tomato plants. On a zucchini, rotting begins on the blossom end as a small watery spot. A calcium deficiency in the fruit is usually the cause. A fluctuating water supply hinders the calcium from reaching the fruit. Blossom end rot is confined to just the fruit of the zucchini plant.