As can be read in the postings below Geranium incanum hates me. I have given up. Pack of 10 seeds germinated last autumn - all died. Pack of 10 seeds sown this spring, all germinated, all long-since dead.
But Geranium x cantabrigiense 'Biokovo' (1st photo) is a great success for me. My original cutting from Leeds has thrived in full sun and this is its 5th summer. A pity I can't persuade it to flower all year but it flowers throughout spring.
I didn't expect G, 'Roxanne' to do well for me. I bought it last autumn and, surprisingly, it's growing well for me. It's in a pot placed on top of a bigger pot containing Salvia 'Amistad' and it grows in the partial shade of the salvia's stems. Sun in the morning is directly onto the plant but by lunch time it has become dappled shade.