[mdjlucan]

Plum What do I feed them to ripen Thanks

[Aunt Sally]

Plums like a fertile soil and feeding in late winter or early spring.

John's advice is here : https://www.allotment-garden.org/fruit/plums-growing/

Putting a mulch around the plum tree now will help with moisture retention.

The best fertiliser to ripen the plums is sunshine