Overview
Silphium albiflorum is a bushy, columnar upright herbaceous perennial in the genus Silphium, part of the Asteraceae family, with deciduous foliage. Silphium albiflorum grows best in full sun and partial shade, and tolerates loam and clay soils and any pH. Its UK hardiness is rated H7. Suggested uses include architectural, cottage and informal garden and flower borders and beds.
About
Silphium albiflorum is a cultivar of the Silphium genus, known for its bushy, columnar upright habit and deciduous foliage. As a sturdy herbaceous perennial, it thrives in full sun or partial shade and is suited to south- or west-facing aspects. It prefers fertile, moist but well-drained loam or clay soils with a pH ranging from acid to alkaline. This cultivar is hardy in the UK (H7) and is valued for its architectural presence in cottage and informal gardens, as well as flower borders and beds. It is best propagated by seed or division and offers seasonal interest in spring and summer.
Growing conditions
Best soil and position for Silphium
- Sunlight
- Full sun, Partial shade
- Soil type
- Loam, Clay
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing, West-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H7
Plant details
Silphium albiflorum size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Bushy, Columnar upright
- Foliage
- Deciduous
- Suggested uses
- Architectural, Cottage and informal garden, Flower borders and beds
Care notes
Pruning and caring for Silphium albiflorum
- Propagation
- Seed, Division
- Pest resistance
- Generally pest-free
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Silphium albiflorum?
Silphium albiflorum prefers full sun and partial shade. It suits exposed and sheltered positions.
What soil does Silphium albiflorum need?
Silphium albiflorum grows best in loam and clay soil. It is happy in soil of any pH. Aim for soil that stays moist but well-drained.
Is Silphium albiflorum hardy in the UK?
Silphium albiflorum has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.
How do I propagate Silphium albiflorum?
Seed, Division.
