Pimpernel willowherb
Epilobium anagallidifolium · Onagraceae
The gardener's calendar
Ideal time to plant pimpernel willowherb: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Onagraceae
- Type
- Herbaceous perennial
- Foliage
- Deciduous
- Flowering
- July to September
- Adult size
- 15 to 30 cm in height
- Hardiness
- Very hardy (down to -20°C)
- Origin
- Mountainous regions of central and northern Europe
- Exposure
- Sun to partial shade
Care
Watering
Willowherb with anagallis-like leaves appreciates regular moisture, particularly during spring and summer growth. Keep the soil moist but well-drained to avoid water buildup. During prolonged dry periods, increase watering, especially if the plant is in a sunny location.
Exposure
This small herbaceous plant thrives in sun to partial shade. It tolerates partially shaded locations well and proves very adaptable to mountain gardens or cool areas. Avoid overly hot exposures in Mediterranean climates, though.
Soil and potting mix
Choose a light, well-drained soil that is slightly acidic to neutral. This species enjoys substrates enriched with organic matter, like those in alpine borders or rock gardens. Regular amendments with fine compost promote its growth.
Fertilizer
A moderate annual application of balanced fertilizer in spring is quite sufficient. Avoid excessive doses that would promote vegetative growth at the expense of flowering. A light organic mulch can advantageously replace additional fertilizer.
Pruning and maintenance
No strict pruning is necessary. Simply remove spent flowers to extend blooming and cut the plant back lightly in late autumn after aerial parts die back. This encourages vigorous regrowth the following spring.
Diseases and pests
Willowherb with anagallis-like leaves enjoys naturally good health. In overly humid conditions, watch for basal rot; improve drainage in that case. Aphids may occasionally settle on it but rarely cause significant damage.
Did you know?
Willowherb takes its name from ancient Greek 'epi' (upon) and 'lobos' (lobe), referring to the petals arranged above the sepals. This small alpine plant was traditionally used in mountain folk medicine, particularly in the Alps, where its cold resistance and compact form make it a favorite choice for high-altitude 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.