When I bought my Geraniums at the beginning of March they were healthy and produced lots of repeat flowers. I religiously dead-headed the plants on a regular basis and fed with MiracleGro to encourage growth.

and

by April the Flower Stalks had started to rot. I sprayed with a fungal spray but it did not seem to make a difference.

then i noticed the main fleshy stems were rotting from the inside. When I cut the geranium stem open it was rotten inside.

and

and

Within a couple of months I now have two sickly tubs of geraniums

After extensive research I now think they have Stem Rot. I am gutted. I thought geraniums were meant to be easy to grow. Has anyone else experienced this problem with geraniums?

Useful links
How to Save Geraniums with Rot
PDF file
https://learningstore.uwex.edu/Assets/pdfs/A2559.pdf