| The only ones that I can think of off-hand that come close to your expectations are the sanguineums, such as John Elsley, Ankum's Pride, etc. The cinereums are another possibility. None of these bloom continuously for three months, but tend to bloom off and on for a long period. For true continual bloom, I would go to an annual geranium (pelargonium). |
Here is a link that might be useful: geranium Ankum's Pride