Do plum trees have companion plants that help the tree and the plants.

Hi ljs, and welcome to ATP.

I'm not sure about plum trees, but I do know that garlic and tansy planted beneath most fruit trees will repel those bugs that you don't want. Tansy repels flying insects, especially Japanese beetles but it also adds potassium to the soil. Garlic takes care of caterpillars and mites.

I'm sure there are others that work well as companion plants, but these two are always my favorites.

Daffodils in a ring around the base will be good, too. The daffodils help deter the harmful grasses and don't hurt the tree at all. Bee Balm is also a good fruit tree companion because it helps attract pollinators, especially honeybees.

Comfrey is a good ground cover because when chopped and left to rot it provides a lot of nutrients to the top of the soil.