Blossom-end rot occurs on the tip of the zucchini, where the flower was originally. If flowers appear but you don't get much fruit, it's probably due to a lack of pollination. I actually grind my eggs shells in a coffee grinder before adding to my plants. On zucchini and other summer squash, the blossom end of the fruit begins to rot and within a short time the entire fruit has rotted. Space plants 24 inches apart, and fertilize the soil with a ready-to-use, slow-release, 14-14-14 granular product applied at a rate of 1/4 pound per 10 square feet when transplanting plants or once while seedlings grow strongly. Female zucchini fruits that aren't pollinated rot and die. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. What Causes Blossom End Rot on Zucchini Squash? Why do my Zucchini rot after the blossom drops off? I have had poor success with growing Zucchini plants that produce zucchini. Please share your solution! My problem is with my zucchini, I grow it in containers on my sun deck where I have had great success with tomatoes in the past so I thought I would try some zucchini this year along with the tomatoes. I would like to know why my zucchini plants look great with lots of flowers and fruit but when the zucchini get about 3-4 inches they start to rot or go soft? A graduate of Leeds University, Jenny Green completed Master of Arts in English literature in 1998 and has been writing about travel, gardening, science and pets since 2007. 1 decade ago. The flower petals of an affected zucchini plant can remain attached, and usually the rest of the fruit is unaffected. Blossom-end rot is caused by a … Zucchini plants begin to produce fruit in early summer in cold climates and early winter and early summer in warm areas, when the weather is often wet and rainy conditions make the ground damp for long periods. Learn which plants thrive in your Hardiness Zone with our new interactive map! Water zucchini plants' soil regularly so that the soil is constantly moist but never sodden. This affects all members of the squash family and tomatoes, peppers, chillies, aubergines (egg plants), and cucumbers. Also, spread a 2- to 3-inch-thick layer of organic mulch, such as garden compost or leaf mold, on top of the soil but not touching the plant stalks; mulch helps retain soil moisture. Poor pollination or a lack of calcium can result in zucchini fruit rotting before it's ready to harvest. Dying Plants. You could add calcium through... Irregular watering is a big cause of blossom end rot. Have something to add? Blossom end rot begins as a small watery bruise at the tip of a zucchini fruit and often spreads and covers the whole end, causing a black or brown sunken depression that can turn moldy. Like other members of the squash family, zucchini is monoecious, bearing both male and female flowers on the same plant. The easiest way is to add crushed egg shells to your soil around your plants. Rotting Blossoms. Zucchini can also be affected by blossom end rot, just like tomatoes and peppers. Relevance. Blossom-end rot is a physiological disorder that occurs on tomatoes, peppers, eggplant, and summer squash. Blossom end rot begins as a small watery bruise at the tip of a zucchini fruit and often spreads and covers the whole end, causing a black or brown sunken depression that can turn moldy. I am in s.f.Bay area,ca.Thanks John. In order to help control fruit rot, put a 2- to 3-inch-thick layer of clean, fresh straw beneath zucchini plants but not touching their stalks, and ensure new fruits are supported by the straw as they develop. It’s caused by a calcium deficiency, but it’s the result of inconsistent watering. Calcium in the soil is … zucchini can also be affected by blossom end rot ’ s pretty easy do! 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