Posted: 07/04/2015 at 11:50
Hi Sarah - I think the geraniums you're referring to are the tender plants which should really be called Pelargoniums.
The geranium 'Mayflower' that AnniD was talking about is a perennial hardy geranium which is a different type of plant and grows outside all year round in the UK.
At one time there was a decision that everyone would call the tender ones Pelargoniums, but garden centres seem to have 'chickened out' for some reason. Daft of them 'cos it's just causing confusion.