Rozanne vs Johnson's Blue geranium
Two blue hardy geraniums, and 'Rozanne' flowers far longer: violet-blue with white centres from early summer until frost, on a plant that sprawls wide and weaves through its neighbours. 'Johnson's Blue' flowers for about a month in early summer, in a clearer lavender-blue, over finely cut leaves, and is a little hardier. Cut it back after flowering for a fresh mound of leaves.
 Cranesbill 'Rozanne'Geranium 'Gerwat' (Rozanne) |  Cranesbill 'Johnson's Blue'Geranium 'Johnson's Blue' | |
|---|---|---|
| Size | 18 in tall, 24 in wide | 18 in tall, 24 in wide |
| Plant | 24 in apart | 24 in apart |
| Zones | 5 to 8 | 4 to 8 |
| Light | Full sun to part shade | Full sun to part sun |
| Soil | Well-drained, average fertility | Well-drained, average fertility |
| Flowers | Early June to early October; blue | Late May to early July; blue |
| Leaves | Medium, herbaceous | Medium, herbaceous |
| Job in a bed | Weaver | Drift |
| Pets | No toxicity recorded | Not checked |
| Deer | No record | No record |
| Native | No | No |
| Spread | Low risk | Low risk |
Rows where they differ are marked. Flowering times are for zone 5.
Which to choose
- Choose cranesbill 'Rozanne' for more shade and a longer show (18 weeks of flower against 6).
- Choose cranesbill 'Johnson's Blue' for colder gardens (to zone 4).
Can they grow together?
Yes: they grow in the same conditions. What cranesbill 'Johnson's Blue' brings beside cranesbill 'Rozanne': in flower together for five weeks, from early June. They share full sun and part sun and zones 5 to 8.
Read more: all about cranesbill 'Rozanne', and all about cranesbill 'Johnson's Blue', each with a bed the planner designed around it.