Patience should pay off. Black Diamond can be a bit more tricky than other watermelons, but it is usually in the area of ripening properly. They normally set ok, just take a long time to ripen and are prone to white heart.

Do they need any nutrient to increase flower production? I am leery of MG again as it promotes leaf growth and that is not my problem.

Have you tried hand pollination?

The female blossoms are out near the far end of strong runners. They have minature fruits behind the blossom and need pollination before noon. To pollinate, pick a male blossom [bright gold color] and pick off the petals and kiss the female [light yellow with green center] blossom lightly and thourally.

Which variety of BD are you growing? If you're growing regular BD or Florida Giant, you're going to have a long wait, and maybe not full ripening. Yellow Belly BD is much more reliable and a better producer. We're having the same weather and I'm watering mine for an hour every day. I get a second crop with YB, and they size down well.

The package didn't say what variety. I will remember yellow belly for next year. I was hand fertilizing the few females I had found. I have to do that this time of year for canteloupe as the bees are having an orgy in my daylilies and could care less about little yellow flowers. Thanks for the advice. I guess I need to water more often, as every 3 days is probably not enough with a drought.