Overview
Corydalis curviflora subsp. rosthornii 'Blue Heron' is a clump forming herbaceous perennial in the genus Corydalis, part of the Papaveraceae family, with evergreen foliage. It typically grows around 0.1-0.5 metres tall and 0.1-0.5 metres wide, reaching full size in around 2-5 years. Corydalis curviflora subsp. rosthornii 'Blue Heron' grows best in partial shade, and tolerates most soils and any pH. Its UK hardiness is rated H5. Suggested uses include cottage and informal garden, patio and container plants and rock garden.
About
This compact, evergreen perennial develops a mound of delicately divided gray-green foliage. From late spring to early summer, it produces fragrant, tubular blue flowers that are grouped along upright red stems.
About the genus
Corydalis includes annuals, biennials, and perennials that can be either tuberous or rhizomatous. The plants feature leaves that are either ternately or pinnately lobed, and they produce racemes adorned with spurred, tubular flowers.
Growing conditions
Best soil and position for Corydalis
- Sunlight
- Partial shade
- Soil type
- Chalk, Loam, Sand, Clay
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- East-facing, North-facing, West-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H5
Plant details
Corydalis curviflora subsp. rosthornii 'Blue Heron' size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Clump forming
- Foliage
- Evergreen
- Height
- 0.1-0.5 metres
- Spread
- 0.1-0.5 metres
- Time to full height
- 2-5 years
- Suggested uses
- Cottage and informal garden, Patio and container plants, Rock garden
- Fragrance
- Flower
Care notes
Pruning and caring for Corydalis curviflora subsp. rosthornii 'Blue Heron'
- Cultivation
- Grow in moderately fertile, moist but well-drained, humus-rich soil in partial shade
- Pruning
- No pruning required
- Propagation
- Propagate by division
- Pest resistance
- Generally pest-free but slugs and snails may damage young growth
- Disease resistance
- Generally disease-free
Frequently asked questions
How do I grow Corydalis curviflora subsp. rosthornii 'Blue Heron'?
Grow in moderately fertile, moist but well-drained, humus-rich soil in partial shade.
Where is the best place to plant Corydalis curviflora subsp. rosthornii 'Blue Heron'?
Corydalis curviflora subsp. rosthornii 'Blue Heron' prefers partial shade. It suits exposed and sheltered positions.
What soil does Corydalis curviflora subsp. rosthornii 'Blue Heron' need?
Corydalis curviflora subsp. rosthornii 'Blue Heron' is adaptable and grows happily in most soil types, including chalk, loam, sand and clay. It is happy in soil of any pH. Aim for soil that stays moist but well-drained.
How do I prune Corydalis curviflora subsp. rosthornii 'Blue Heron'?
No pruning required.
How big does Corydalis curviflora subsp. rosthornii 'Blue Heron' grow?
Corydalis curviflora subsp. rosthornii 'Blue Heron' reaches a height of 0.1-0.5 metres and a spread of 0.1-0.5 metres. It takes around 2-5 years to reach full size.
Is Corydalis curviflora subsp. rosthornii 'Blue Heron' hardy in the UK?
Corydalis curviflora subsp. rosthornii 'Blue Heron' has a UK hardiness rating of H5.
How do I propagate Corydalis curviflora subsp. rosthornii 'Blue Heron'?
Propagate by division.