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Sweet fern

Comptonia peregrina · Myricaceae

The gardener's calendar

The right move for September

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

JFMAMJJASOND Planting

ID card

Foliage
Deciduous, finely cut and aromatic
Flowering
Spring (April-May), discrete catkins
Adult size
0.6 to 1.5 m in height, spreading bushy habit
Growth
Moderate
Hardiness
Very hardy, down to -20 °C
Origin
North America (forests and acidic heathlands)
Soil type
Acidic to neutral, light and well-drained

Care

Watering

Moderate watering during the growing period. Once established, sweet fern tolerates relative drought thanks to its deep root system. Avoid excess moisture which promotes rot. In dry climates, water at planting and during very hot periods.

Exposure

Place it in full sun or partial shade for compact growth and better flowering. It adapts to partially shaded areas but grows more slowly there. Prefer a well-ventilated exposure to promote air circulation.

Soil

Choose acidic, light and well-drained soil. Sweet fern adapts to poor and sandy soils. Improve drainage in heavy soil by incorporating sand or fibrous organic matter. It tolerates calcareous and compacted soils poorly.

Pruning and training

Prune lightly after flowering to maintain a compact, airy habit. Remove dead or diseased branches. Rejuvenation every 5-7 years may be useful if the shrub becomes too woody. Avoid severe pruning which weakens the plant.

Fertilizing

Very undemanding, sweet fern mainly benefits from well-decomposed organic matter in autumn. Avoid excess nitrogen fertilizers which can promote disorderly growth at the expense of flowering. An annual light compost application is sufficient.

Diseases and pests

Robust plant, relatively resistant to common diseases. Watch for scale insects and mites in dry climates. Stagnant moisture can cause root or fungal rot. Ensure good drainage and ventilation. No major pests documented in temperate zones.

Did you know?

Sweet fern owes its scientific name to French botanist Henry Compton (1632-1713), Bishop of London and passionate about exotic botany. Its nickname "peregrina" (traveller) celebrates its arrival in Europe from the New World. Remarkably, its finely cut and strongly aromatic leaves – with a sharp, peppery fragrance – remain attractive in herbals for a long time, explaining its historical interest among collector botanists.

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.