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Birthwort

Aristolochia clematitis · Aristolochiaceae

The gardener's calendar

The right move for September

In autumn, ease off feeding and take the chance to clean up around birthwort and prepare for winter.

JFMAMJJASOND Planting

ID card

Foliage
Deciduous
Flowering
Spring to summer (April-July)
Adult size
3 to 4 m in length
Growth
Moderate to fast
Hardiness
Down to -15 °C
Origin
Central and southern Europe
Soil type
Rich, well-drained, slightly acidic to neutral

Care

Exposure

Install your birthwort in a sunny to partially shaded location to optimize flowering. It tolerates partial shade but will flower less abundantly. Protect it from strong winds that could damage its flexible stems.

Watering

Water regularly in summer, keeping the soil moist but not waterlogged. During active growth, increase frequency in dry weather. Reduce watering in autumn and winter when the plant goes dormant.

Soil and planting

Prepare a rich substrate improved with compost or potting soil. Install a trellis or sturdy support at planting time. A layer of mulch will help maintain moisture and regulate soil temperature.

Pruning and training

Prune lightly after flowering to remove dead or misplaced branches and guide growth. Avoid heavy pruning. In late winter, clean out dead wood and restructure if necessary.

Fertilizing

Apply a balanced fertilizer in spring and a second application in early summer to support flowering. Limit excess nitrogen, which would promote foliage at the expense of flowers. Annual compost is often sufficient for an established plant.

Pests and diseases

Birthwort is generally hardy. Watch for aphids and spider mites in hot, dry climates. Excessive moisture can promote fungi: ensure good foliage ventilation. Chemical treatment is generally unnecessary under healthy conditions.

Did you know?

Aristolochia clematitis has been renowned since antiquity for its flower shape resembling a small pipe: its Greek name "aristolochia" literally means "useful for childbirth." It was long used in traditional medicine, although certain plant compounds present internal use risks. Today, it is mainly appreciated as an ornamental for its singular yellow-green tubular flowers and spectacular climbing habit.

Where to buy it

Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.

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