If your geraniums aren't doing as well as usual check the growing tips to see if they have been attacked by a caterpillar known as 'pino procesional'. It is a bristly little thing varying in colour from pale cream to a vibrant green. The largest one I have seen is about 1.5cm long. The little sods burrow into the growing tip and take up residence inside, quickly devouring the inside of the stem. Often the first sign of infestation is the stem turning black. The 'green' solution is to cut off eac