How to look after your cinereum’s
Ideally you should treat your cinereum and subcaulescens geraniums and Erodiums like alpine plants....
When to tidy your geraniums
Being as some geraniums will have a short seasonal flowering period, such as spring or summer and some will go nearly all year long, it really depends on the individual plant and the weather. The reason I mention the weather is that if it is particularly hot or dry this will be more gruelling for all your garden plants and will take its toll on the plants vigour and therefore reduce the flowering period.