Q.Watermelons
What is the best fertilizer to use when your watermelon plants first start to Blossom and show the first sign of fruit?

Downtoearthdigs
Answered on June 8, 2019
We do not recommend certain products, but any bloom formula will do. You will need higher phosphorus and potassium levels for fruit production, so anything with high P and K values, with just a touch of N will be perfect, no matter the brand.
https://www.gardeningknowhow.com/edible/fruits/watermelon/growing-watermelon.htm
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