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Hollow-root corydalis

Corydalis cava · Papaveraceae

The gardener's calendar

The right move for September

Ideal time to plant hollow-root corydalis: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Family
Papaveraceae
Foliage
Deciduous
Flowering
February to April
Mature size
20 to 30 cm in height
Hardiness
Very hardy (down to -15°C)
Origin
Central and southern Europe
Soil type
Well-drained, rich in humus
Growth
Rapid in spring, summer dormancy

Care

Watering

Water regularly in spring, especially during flowering and before leaves appear. Gradually reduce watering after flowering. Keep soil moist but well-drained: excess moisture in summer during dormancy can rot the tubers.

Light exposure

Choose a semi-shaded location or light woodland. Hollow corydalis appreciates spring light before trees leaf out, then tolerates shade in summer. Avoid hot afternoon sun.

Soil

Prepare soil rich in organic matter, well-drained and preferably slightly chalky. Work in compost or peat at planting time. A light mulch of fallen leaves helps maintain spring moisture and protects the tubers.

Fertilizing

Well-decomposed compost added in autumn is usually sufficient. Avoid high-nitrogen fertilizers that would promote foliage at the expense of flowers. A light balanced fertilizer boost at growth start can support flowering.

Pruning and deadheading

Let the foliage yellow naturally after flowering to rebuild tuber reserves. Only remove dead or diseased parts. After summer dormancy, no intervention is needed.

Diseases and pests

Hollow corydalis is generally robust. Watch out especially for tuber rot if soil is too wet or poorly drained. Slugs can damage young shoots in spring: loose mulch reduces this risk.

Did you know?

Hollow corydalis gets its scientific name 'cava' from its hollow, lightweight underground tubers. A classic spring plant of European forests, it was long used in traditional medicine for its supposed properties, particularly in folk phytotherapy. Its early flowering makes it an ideal companion for other geophytes in naturalized gardens.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.