Hi, Star: Yes, your American plum needs cross-pollination and in fact is an excellent cross-pollenizer itself. Your Italian prune plum is probably self-pollinating (“probably,” because these days there are various hybrids out there with differing characteristics) but of course could still help the American. Give it some time. Also, read up (in the Old Farmer’s Almanac and also in the Old Farmer’s Almanac Garden Guide print publications, as well as here on Almanac.com) on how to make sure that your place is as pollinator-friendly (e.g., bees) as possible. The other thing you might do is ask at Home Depot. Perhaps they get these questions and have answers specific to what they sell. Thanks for asking, and good luck!
Hi, Star: Yes, your American plum needs cross-pollination and in fact is an excellent cross-pollenizer itself. Your Italian prune plum is probably self-pollinating (“probably,” because these days there are various hybrids out there with differing characteristics) but of course could still help the American. Give it some time. Also, read up (in the Old Farmer’s Almanac and also in the Old Farmer’s Almanac Garden Guide print publications, as well as here on Almanac.com) on how to make sure that your place is as pollinator-friendly (e.g., bees) as possible. The other thing you might do is ask at Home Depot. Perhaps they get these questions and have answers specific to what they sell. Thanks for asking, and good luck!