Tree Peony Problems

Just to add I saw Bordeaux mixture in the SM this morning.

Not tempted to use it as I prefer to try and grow healthy plants and/or or use net barriers that see off pests and diseases but I did see our beef cattle farmer neighbours' veggie plot soon after we moved here and their row of young cauli plants was blue. Not appetising.

 

@Alf Many horticultural retailers offer a replacement service if any purchase fails to grow or dies. Have you checked with the garden centre where you purchased these peonies?

 

Flowers of sulphur is a good fungicide.