Overview
Geranium robertianum 'Celtic White' is a bushy annual biennial in the genus Geranium, part of the Geraniaceae family, with deciduous foliage. It typically grows around 0.1-0.5 metres tall and 0.1-0.5 metres wide, reaching full size in around 1 year. Geranium robertianum 'Celtic White' grows best in full sun and partial shade, and tolerates most soils and any pH. Its UK hardiness is rated H6. It is attractive to pollinators. Suggested uses include cottage and informal garden, wildflower meadow and wildlife gardens.
About
"Geranium robertianum 'Celtic White' is an annual or biennial plant that typically reaches a height of about 30 cm. It develops a rosette of fragrant green foliage, featuring deeply lobed leaflets. In the summer months, it produces clusters of small, star-like white flowers."
About the genus
Geraniums encompass a variety of growth forms, including annuals, biennials, and perennials. These plants can be herbaceous or evergreen and feature rounded leaves that are typically palmately lobed or divided. Their flowers are characterized by a loose arrangement and consist of five petals.
Growing conditions
Best soil and position for Geranium
- Sunlight
- Full sun, Partial shade
- Soil type
- Chalk, Clay, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained, Well-drained
- Aspect
- East-facing, North-facing, South-facing, West-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H6
Plant details
Geranium robertianum 'Celtic White' size, habit and characteristics
- Plant type
- Annual Biennial
- Habit
- Bushy
- Foliage
- Deciduous
- Height
- 0.1-0.5 metres
- Spread
- 0.1-0.5 metres
- Time to full height
- 1 year
- Suggested uses
- Cottage and informal garden, Wildflower meadow, Wildlife gardens
- Fragrance
- Foliage
Care notes
Pruning and caring for Geranium robertianum 'Celtic White'
- Cultivation
- Thrives in sun or shade in any soil. It can be useful for ground cover in shaded areas, but self-seeds readily, with the potential to become a nuisance if not kept in check. See herb robert for further information and advice on how to control
- Pruning
- No pruning required
- Propagation
- Propagate by seed. Plants often self-seed in place, though less vigorously than the species
- Pest resistance
- Generally pest-free, but may be susceptible to slugs and snails
- Disease resistance
- Generally disease-free, but may be susceptible to powdery mildews in dry conditions
Frequently asked questions
How do I grow Geranium robertianum 'Celtic White'?
Thrives in sun or shade in any soil. It can be useful for ground cover in shaded areas, but self-seeds readily, with the potential to become a nuisance if not kept in check. See herb robert for further information and advice on how to control.
Where is the best place to plant Geranium robertianum 'Celtic White'?
Geranium robertianum 'Celtic White' prefers full sun and partial shade. It suits exposed and sheltered positions.
What soil does Geranium robertianum 'Celtic White' need?
Geranium robertianum 'Celtic White' is adaptable and grows happily in most soil types, including chalk, clay, loam and sand. It is happy in soil of any pH. Aim for soil that stays moist but well-drained to well-drained.
How do I prune Geranium robertianum 'Celtic White'?
No pruning required.
How big does Geranium robertianum 'Celtic White' grow?
Geranium robertianum 'Celtic White' reaches a height of 0.1-0.5 metres and a spread of 0.1-0.5 metres. It takes around 1 year to reach full size.
Is Geranium robertianum 'Celtic White' hardy in the UK?
Geranium robertianum 'Celtic White' has a UK hardiness rating of H6.
How do I propagate Geranium robertianum 'Celtic White'?
Propagate by seed. Plants often self-seed in place, though less vigorously than the species.
Is Geranium robertianum 'Celtic White' good for pollinators?
Yes — Geranium robertianum 'Celtic White' attracts and supports pollinators such as bees and other beneficial insects.