Overview
Polemonium is a bushy, clump forming, spreading herbaceous perennial in the genus Polemonium, part of the Polemoniaceae family, with deciduous foliage. Polemonium grows best in full sun and partial shade, and tolerates most soils and any pH. Its UK hardiness is rated H7. Suggested uses include cottage and informal garden, patio and container plants and flower borders and beds.
About
Polemonium, commonly known as Jacob's ladder, is a genus of herbaceous perennials or annuals that form bushy, spreading clumps. These plants have pinnate, deciduous leaves and produce clusters of tubular or bell-shaped flowers. They thrive in fertile, moist but well-drained soils and can be grown in full sun or partial shade, suitable for various garden aspects and exposures. Hardy to UK zone H7, Polemonium is ideal for cottage gardens, flower borders, and containers, offering interest through summer and autumn.
Growing conditions
Best soil and position for Polemonium
- Sunlight
- Full sun, Partial shade
- Soil type
- Chalk, Clay, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing, East-facing, West-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H7
Plant details
Polemonium size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Bushy, Clump forming, Spreading
- Foliage
- Deciduous
- Suggested uses
- Cottage and informal garden, Patio and container plants, Flower borders and beds
Care notes
Pruning and caring for Polemonium
- Propagation
- Division in spring, Seed sown in containers in a cold frame in autumn or spring
- Pest resistance
- Generally pest-free
- Disease resistance
- May be susceptible to powdery mildews
Frequently asked questions
Where is the best place to plant Polemonium?
Polemonium prefers full sun and partial shade. It suits exposed and sheltered positions.
What soil does Polemonium need?
Polemonium 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.
Is Polemonium hardy in the UK?
Polemonium has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.
How do I propagate Polemonium?
Division in spring, Seed sown in containers in a cold frame in autumn or spring.
