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turning black and drying upI was excited to see 5 small watermelons starting on 3 different plants a few weeks ago, but most of those turned black and dried up. Two of them are growing, but still small like a baseball. I have seen more start, but turn black and shrivel up as well. Today I noticed a few more starting, so I am hoping they survive. What causes them to turn black and dry up? I was surprised, since some of them had been golf ball size, though most are very small, like marbles. Thanks for your help!