Flowering plants need bees to pollinate them. Some flowering plants can pollinate themselves but most need help from another plant that is like them. A plum tree needs another plum tree to pollinate it in order for it to produce fruit. If there are no plum trees in the vicinity that can pollinate the tree then there will be no plums produced. You can pollinate the tree by hand to make fruits.
You can take a flower from another plant and touch the insides of the flowers together of a plant that you want to make fruit. A plum tree that does not have another plum tree nearby can be pollinated by hand. Just pick a flower from another plum tree and touch the flowers of the plum tree with the flower you picked. Make sure you touch the flower pollen’s together to pollinate the tree with the connected flowers on it.
You can pollinate flowers of many kinds by mixing like pollen’s together. Once the flowers are pollinated they will produce fruit. This can be done with peach, apple and pear trees.
All you need is a donor flower from a donor tree. Then take that flower and let its pollen’s touch the inside of the flowers on the tree that you want the fruit from.
You can also pollinate bushes and flowers this way. Some trees need to be pollinated with trees that are exactly like them. Others need to be pollinated with a tree of the same kind but a different variety. Like the plum tree needs to be pollinated by another plum tree that is a different kind. I use a wild plum tree flower for my domestic plum tree and I get some great fruits every year.
If you do not want to stand there and touch the pollen’s of a donor flower to the pollen’s of other flowers you can just stick a branch with flowers on it from the donor tree into the branches of the tree you want the fruit from and let the bees pollinate the flowers for you.
You can get some fabulous fruits from your single trees by pollinating them by hand. It really does not take long to do. The hard part is finding a donor tree to get the flower from. Once you have pollinated the tree you can sit back and watch the fruit develop into tasty treats.