Blossom rot in watermelons is caused by a lack of calcium, but simply adding more calcium isn’t going to help the situation. More often than not, watermelon blossom end rot occurs when water levels are fluctuating during fruit initiation.Click to see full answer. Consequently, how do you keep watermelon from rotting? Water Retention Provide watermelons with 1 to 1-1/2 inches of water each week during fruiting to help avoid blossom end rot. You can further protect your crop by applying a plastic mulch or 2 to 4 inches of organic mulch around the watermelon crown and under its leaves.Also Know, why are my watermelons turning black and dying? When a watermelon plant is deficient in calcium or suffering from drought or excessive nitrogen, it may develop blossom end rot, which shows as a pale green to brown to black discoloration on the end of the fruit where the flower was. Subsequently, one may also ask, how do you treat blossom end rot in watermelon? If you have been in very dry conditions, provide consistent irrigation at a rate of 1 inch per week. If your ph is off, add dolomitic lime at 5 pounds per 100 sf to raise the ph one point in loam soil. If there isn’t enough calcium, add dolomitic lime. Do watermelons rot?Watermelons (Citrullus lanatus) take around 90 days from planting the seeds to harvesting the fruit — a long time in the world of vegetable growing. A watermelon that’s rotting on the bottom, a condition known as belly rot, can be sorely disappointing. Fortunately, the problem can be corrected in future seasons.

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