Overview
Silphium mohrii is a bushy, columnar upright herbaceous perennial in the genus Silphium, part of the Asteraceae family, with deciduous foliage. Silphium mohrii 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 mohrii is a cultivar of the Silphium genus, known for its bushy, columnar upright habit and deciduous foliage. As a member of the Asteraceae family, it thrives in full sun or partial shade and prefers fertile, moist but well-drained soils such as loam or clay with a range of pH levels. This hardy perennial is suitable for exposed or sheltered south- or west-facing aspects and is valued for its architectural presence in cottage and informal gardens, as well as flower borders and beds. It is propagated by seed or division and is of interest during 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 mohrii 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 mohrii
- Propagation
- Seed, Division
- Pest resistance
- Generally pest-free
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Silphium mohrii?
Silphium mohrii prefers full sun and partial shade. It suits exposed and sheltered positions.
What soil does Silphium mohrii need?
Silphium mohrii 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 mohrii hardy in the UK?
Silphium mohrii 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 mohrii?
Seed, Division.
