How Can I Rectify The Soil Where My Campanulas Lactiflora Have Yellow Leaves With Green Veins

Question

I also have one rose that has the same problem otherwise it is just the campanulas, it happenś on old leaves, also on a prunus tree, Otherwise all good

Answer 1

That is usually an iron chlorosis issue. This article should help:

https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm