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Corydalis curviflora var. rosthornii 'Heronswood Form' – Fragrant Blue Corydalis

Corydalis curviflora var. rosthornii 'Heronswood Form'

This variety has fragrant, deep blue, cornucopia-shaped flowers carried tightly on red stems above 6-inch tall, blue-green foliage. It is considered one of the best blue forms for color and performance.

Growing Conditions & Care

Prefers partial shade in moist, well-drained soil. Goes dormant in high temperatures.

Propagation

Sow seed when fresh; germination may be erratic. Divide in fall.

Potential Problems

Downy mildew, rust, aphids, slugs, snails; spider mites indoors.

Quick Reference

Height/Spread: 6–12 in.
Light: Part shade only
Moisture: Medium
Maintenance: Low
Bloom Time: Early spring to summer
Flower Color: Blue
Uses: Beds, borders, ground covers, naturalizing, specimen, cottage gardens, woodland gardens
Type: Perennial

Other: Arkansas Blue Star (Amsonia hubrichtii): Feathery Foliage, Blue Flowers, Golden Fall Color; Caulophyllum thalictroides: Blue Cohosh for Woodland Gardens; Corydalis aurea – Scrambled Eggs, Native Biennial with Yellow Flowers; Corydalis curviflora var. rosthornii 'Heronswood Form' – Fragrant Blue Corydalis; Corydalis elata – Fragrant Blue Corydalis, Heat Tolerant; Corydalis flexuosa 'Blue Panda' – Compact Fragrant Blue Corydalis; Corydalis flexuosa 'China Blue' – Sky-Blue Corydalis for Woodland Gardens; Corydalis linstowiana – Purplish-Blue Biennial Corydalis; Corydalis ochroleuca – Creamy White Corydalis, Self-Sowing Perennial; Corydalis solida – Fumewort, Spring Ephemeral for Rock Gardens

Garden Articles

Corydalis cheilanthifolia – Fern-Leaved Corydalis with Bronzy Foliage

Corydalis lutea – Yellow Corydalis, Long-Blooming Shade Perennial

Corydalis 'Blackberry Wine' – Fragrant Pink-Purple Corydalis for Shade

Mrs. Robb's Bonnet (Euphorbia amygdaloides var. robbiae): Glossy Evergreen Groundcover

'Butterfly Blue' Pincushion Flower (Scabiosa 'Butterfly Blue'): Long-Blooming Lavender Pincushions

Tiarella 'Heronswood Mist': Clump-Forming Foamflower with Misty Pink-Cream-Green Foliage

Veronica 'Georgia Blue' (Speedwell): Tough Sky-Blue Groundcover

Plants

‘Short Stack’ Dwarf Blue Star (Amsonia montana ‘Short Stack’): Compact Blue Blooms for Small Spaces

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Chrysogonum virginianum var. australe: Goldenstar Groundcover

Corydalis flexuosa 'Purple Leaf' – Blue Flowers with Purple-Tinged Foliage

Deutzia crenata var. nakaiana 'Nikko': Compact White-Flowered Groundcover Shrub

Euphorbia 'Glacier Blue': Otherworldly Variegated Foliage & Giant Bract Clusters

Blue Spike Grape Hyacinth: Double Flax-Blue Heads for Longer Bloom