How can I eradicate Delphinium mildew?
Dorset, United Kingdom
I have a pot of delphiniums that have already flowered, but I was hoping to get a second showing. I trimmed the flower stems back down to the base and although it now has a lot of leaves, they appear to be covered in mildew. I tried cutting off the affected leaves, but the mildew is still there. Has my plant 'had it' or is there a remedy? Please help.
- 19 Aug, 2012