It's hot in Greece. Hotter than the deep South where I grew up and Persimmons grew but tended not to fruit... I never, in 20 years, saw fruit on the grown persimmon trees at the back of our property.
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Persimmon have male and female trees and on occasion both male and female flowers on one tree . You may have had all male trees . Also some female trees are parthenocarpic . Meaning they can have seedless fruit if not pollinated .It's hot in Greece. Hotter than the deep South where I grew up and Persimmons grew but tended not to fruit... I never, in 20 years, saw fruit on the grown persimmon trees at the back of our property.
Yeah, my issue was I hand-pollinated spaghetti with scallop pollen just to set fruit on the first female flowers. Next year I ran out of spaghetti squash seeds, forgot I intentionally crossed mine, said "oh my volunteers are always 100% spaghetti", planted the seeds, and ended up with something bland and watery, which is too bad because that cross is terribly prolific. I've actually never gotten an unintentional cross from the bees.Squash have 4 common species and a fifth uncommon . Most of what people plant is in the C. Pepo group . So they cross readily . You can hand pollinate to save seed . Butternut is C. Moschata group and you are pretty safe there . Anything it can cross with Is going to give much the same flesh and flavor . C . Maxima is the big pumpkins and Hubbard types . C. Agrosperma is the Cushaw types . You could plant 1 of each group only and get pure seed . However your neighbor and the bees will likely mess up the C. Pepo group . You could plant Butternut , a Cushaw and a Hubbard and get pure seed . There is also the C . Mixta group but I can not remember any of the varaties .
I have got crosses from bees . I had a Filipino lady living 1/4 mile away . I saved summer squash seed . The next year I got these really skinny and long squash . About 2 inches diameter and 18-24 inches long . Comparing info mine looked like her squash and her squash looked different .Yeah, my issue was I hand-pollinated spaghetti with scallop pollen just to set fruit on the first female flowers. Next year I ran out of spaghetti squash seeds, forgot I intentionally crossed mine, said "oh my volunteers are always 100% spaghetti", planted the seeds, and ended up with something bland and watery, which is too bad because that cross is terribly prolific. I've actually never gotten an unintentional cross from the bees.
I have seen native persimmons all the way down to almost the gulf coast. They grow wild on my property and up and down the road side. Some seem to never fruit (male/females perhaps?) others fruit prolifically at a fairly small size (only 12 to 15 feet tall). The insects love them on the tree and the deer and raccoons love them on the ground! I have seen persimmons all across the state of Tennessee. And it gets pretty hot and humid in west Tennessee. Likely too little water at a crucial time after a new planting or too much! The wood is nice looking in a wood project. I have never tried to grow any. May I suggest a square yard of weed fabric around each young tree, as I saw that work well for a reforestation/enhancement project here. It keeps the competition down around the young plant, without constant weeding or chemicals and keeps the mower or weed eater away from them for a few years. I also see some nurseries use a lighter shade cloth (maybe 30 % shade) over young tree seedlings to help them in the hot summer sun. Also planting them where they can receive some afternoon shade will help reduce stress on new plantings. Good luck with your efforts! I have been wanting to do some similar plantings with Black Walnut, Catalpa and Tupelo trees. All are declining in this area from over harvesting and little to no replanting efforts.