Your question is complex. In general the seeds from seedless watermelons are not going to work well. Seedless watermelon seeds can be purchased. They are Triploid. Three sets of genes. Basically difficult to grow. But it can be done. When growing you need regular pollen from a normal watermelon to fertilize the seedless variety. They try to form seeds but they mix a triploid with a diploid. Because of this the seeds do not form. Well mostly they do not form. Also the melon around the seed stays firm. Which is good. So you saved some seeds of this triploid diploid mix. What will you get. Who knows. usually nothing because they will try to form seeds that will most likely not grow or form. But with luck who knows what you have and what you will get. It is a long shot. but you might get something. If you get some triploid pollen onto a triploid female you might wind up with seedless triploid watermelon seeds. But it is not suppose to work. Everything is suppose to die. The easy way is to buy known seeds. The experts purposely cross diploids with tetraploids to make triploids. Two triploids are not suppose to work. It is a mess with lots of sterility and death. Part of your problem is that the seeds you have were generated only HALF from Seedless watermelon. The other half of those seeds is regular diploid watermelon seeds. So you dont really have seedless watermelon seeds. You only have half of your seeds come from seedless watermelon genetics. the other half of the seed comes from unknown regular watermelon seeds used to pollenate the seedless plants. I would not bother growing the plants from seedless watermelons. Unless you have lots of acres of land to experiment with.

Maybe Pepino, aka Melon Pear, ie Solanum muricatum? Here is a link that might be useful: S muricatum

Sorry to hear about your cucumbers Helen. I got seeds for one called Straight Eights I saw recommended, but misplaced the seed packet so I didn't plant any cucumbers this year. My dad planted a burpless type last year that had very few seeds inside and a wonderful flavor but they were mislabeled so we don't know what they were. I didn't plant any cantaloupes this year either. What kind did you plant GLD? I have a short wishlist of seeds from Baker Creek but they're out of stock on all of them right now. I guess it's too early. I'm determined to try Orangeglow Watermelons and Ali Baba. I may start over in a different part of my yard with a new melon patch after having my vines eaten in two and I also have a strange looking melon that I think may be diseased. It's mottled looking but not rotten or anything. It may just be some weird cross but I doubt it. I decided to let it grow to see what happens. It's a little bigger than a bowling ball now but not ripe yet. I posted the same photo in the Vegetable Forum a few weeks ago but didn't get any definite answers. Here is a link that might be useful: Post in Vegetable Forum

I was thinking that might be it. I'm just not sure how a plum granny got there. They are maybe an inch in diameter. I don't think they are getting bigger now that they changed colors.