About
Plenum' is smaller in stature than the species itself and bears double blue-purple flowers in summer, set against rounded leaves.
About the genus
Geranium can be annuals, biennials and perennials, herbaceous or evergreen, with rounded, usually palmately lobed or divided leaves, and lax inflorescences of rounded, 5-petalled flowers
Growing conditions
SunlightFull sun, Partial shade
Soil typeChalk, Clay, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained, Well-drained
AspectSouth-facing, North-facing, West-facing, East-facing
ExposureExposed, Sheltered
UK hardinessH7
Plant details
Plant typeHerbaceous Perennial
HabitBushy
FoliageDeciduous
Height0.1-0.5 metres
Spread0.1-0.5 metres
Time to full height2-5 years
Suggested usesGravel garden, Cottage and informal garden
ToxicityHarmful if eaten. Wear gloves and other protective equipment when handling. Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Care notes
CultivationGrow in any, moderately fertile soil apart from waterlogged soils in full sun or partial shade
PruningRemove flowered stems and old leaves to encourage the production of fresh leaves and flowers
PropagationPropagate by division in spring or propagate by softwood basal cuttings in early to mid spring and root with bottom heat
Pest resistanceMay be susceptible to vine weevil, capsid bug and sawflies
Disease resistanceMay be susceptible to downy mildews and powdery mildews