Our new hedge has made an excellent start this spring but now a few of the older leaves are going yellow what can we do?
Certified GKH Gardening Expert
This can be a few different issues, depending on the species of shrub that it is. Some plants show this as a deficiency of calcium or magnesium, although it can be an iron deficiency in some species. If you can provide the plant name, I will be more than glad to help.