I had the first two watermelons from my garden over the weekend!
The two watermelon varieties are White Sugar Lump and Orangeglo and neither were very flavorful so I probably ate them too soon. Another probably-not-ripe-indicator is that the Orangeglo isn't glowing orange. I had them in a fruit salad with a plum, a fantastic tasting peach, and a perfectly sweet banana. These two are the only fruit of these varieties that I will get this year, I have a few other varieties that I am excited to taste, but will wait to pick them.