brown spot

Question

my newly purchased 30/05/19 hydrangeas (3) RED BARON have not flowered and have now got brown spots that are getting larger can you help i have them singly in pots they have grown about double in size are well watered and fed i also added a 6 month slow feed at planting

Answer 1

It sounds like they may be a little TOO well watered. This sounds like, either, a fungal or bacterial infection.

In either case, a fungicide and removing the infected growth, as well as pruning the shrub at the appropriate time can help.

These articles will give you more information: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-container-care.htm