Overview
Geranium 'Slack's Purple Stargazer' is a clump-forming, mat-forming, trailing, carpet-forming herbaceous perennial in the genus Geranium, part of the Geraniaceae family, with light green, bright green, silvery, dissected, patterned foliage. Geranium 'Slack's Purple Stargazer' grows best in full sun, and tolerates loam soils and neutral pH. Its UK hardiness is rated H5. Suggested uses include borders, cottage gardens, rock gardens, woodland beds and containers.
About
Geranium 'Slack's Purple Stargazer' is a cultivar of the Geranium genus, which includes a range of herbaceous and evergreen plants with rounded, often palmately lobed leaves and five-petalled flowers arranged loosely. This cultivar forms clumps and mats, making it suitable for use in borders, cottage gardens, rock gardens, woodland beds, and containers. It thrives in well-drained loam soil with a neutral pH, preferring full sun and a sheltered aspect facing south, west, or east. Hardy to UK zone H5, it is best grown in moderately fertile soil and can be propagated by seed, division, or cuttings.
Growing conditions
Best soil and position for Geranium
- Sunlight
- Full sun
- Soil type
- Loam
- Soil pH
- Neutral
- Soil moisture
- Well-drained
- Aspect
- South-facing, West-facing, East-facing
- Exposure
- Sheltered
- UK hardiness
- H5
Plant details
Geranium 'Slack's Purple Stargazer' size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Clump-forming, Mat-forming, Trailing, Carpet-forming
- Foliage
- Light green, Bright green, Silvery, Dissected, Patterned
- Suggested uses
- Borders, Cottage gardens, Rock gardens, Woodland beds, Containers
Care notes
Pruning and caring for Geranium 'Slack's Purple Stargazer'
- Propagation
- Seed, Division, Cuttings
- Pest resistance
- Aphids, Vine weevil, Caterpillars, Thrips
- Disease resistance
- Grey moulds
Frequently asked questions
Where is the best place to plant Geranium 'Slack's Purple Stargazer'?
Geranium 'Slack's Purple Stargazer' prefers full sun. It suits sheltered positions.
What soil does Geranium 'Slack's Purple Stargazer' need?
Geranium 'Slack's Purple Stargazer' grows best in loam soil. It prefers neutral soil. Aim for soil that stays well-drained.
Is Geranium 'Slack's Purple Stargazer' hardy in the UK?
Geranium 'Slack's Purple Stargazer' has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.
How do I propagate Geranium 'Slack's Purple Stargazer'?
Seed, Division, Cuttings.
More in the Geranium genus
- Geranium 'Brookside'Geranium

- Geranium 'Copper Tiger'Hardy Geranium

- Geranium 'Nimbus'Geranium
- Geranium 'Orion'

- Geranium 'Patricia'

- Geranium 'Purple Rain'cranesbill 'Purple Rain'

- Geranium 'Red Dwarf'

- Geranium 'Rozanne'