Growing Watermelon

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08 Jun 22 Marlow (USA - Zone 9a climate)
I seem to have bottom rot on my watermelons. Two out of 3 are effected. I've read that it's because the soil is lacking calcium. I'll be getting a soil tester tomorrow to check the pH. What would be the best thing to add calcium to the soil? I just don't know if that would work or if I should start new seeds and plant in an area that already has the pH suitable for watermelons...
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17 Jun 22 (USA - Zone 4a climate)
Probably too late now but use Epsom Salts - scatter some of this in your soil in future especially where you plant the seeds.
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13 Jun 22 Sarah (USA - Zone 9b climate)
Maybe adding eggshells to the soil will help
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