Epilobium obscurum
Epilobium obscurum · Onagraceae
The gardener's calendar
Ideal time to plant epilobium obscurum: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Onagraceae
- Type
- Perennial herbaceous plant
- Foliage
- Deciduous
- Flowering
- July to September
- Adult height
- 30 to 60 cm tall
- Hardiness
- Very hardy (down to -15°C)
- Origin
- Western and central Europe
- Soil type
- Fresh, moist, well-drained soils
Care
Watering
Dark-leafed willowherb appreciates fresh soil and doesn't tolerate prolonged dryness. Water regularly during the summer season, particularly during hot spells, to maintain moist but not waterlogged soil. In autumn and winter, reduce watering based on natural rainfall.
Exposure
This plant thrives in full sun to partial shade. It tolerates partially shaded areas well, where it can even be more lush. Avoid locations that are too dry in scorching full sun.
Soil preparation
Prepare soil rich in organic matter, fresh and well-drained. Incorporate compost or potting soil at planting time to promote moisture retention. Slightly acidic to neutral soils are ideal for this species.
Pruning and maintenance
Cut back the plant in late winter or early spring, before new growth begins. This operation promotes a dense and compact clump. Remove spent flowers to prolong flowering and limit self-seeding.
Fertilizing
A moderate application of balanced fertilizer in spring is generally sufficient. In rich soil, fertilizing may be unnecessary. Avoid excess nitrogen, which would promote overly dense foliage at the expense of flowers.
Pests and diseases
Dark-leafed willowherb is rarely affected by diseases if drainage is correct. In overly moist or waterlogged soils, root rot may appear. Regularly check the foliage to detect any pest problems, which are generally rare on this species.
Did you know?
Willowherbs belong to the genus Epilobium, whose name means 'on the pod' in Greek, because the flowers appear above the characteristic elongated fruit. After flowering, this plant produces lightweight seeds equipped with silky bristles that disperse on the wind, allowing it to colonize moist areas and disturbed zones.
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.