Willowherbs (Epilobium)

Willowherbs

Also known as: Boisduvalias

The willowherbs (Epilobium) are a large and highly diverse group of flowering plants in the evening primrose family. Willowherbs can be extremely hardy plants, and they are often some of the first to colonize disturbed or burnt landscapes. Many willowherbss are used symbolically or in crests or sigils - Fireweed (C. angustifolium), for instance, is the official flower of the Yukon Territory, and is displayed on its flag.

Scientific classification

Genus

Willowherbs (Epilobium)

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60 cm to 1.5 m

Spread

Deciduous

Leaf type

Summer

Growth Season

Rapid

Growth Rate

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Opposite or whorled leaves, ovate to lanceolate, 1-5 inches (2.5-12.7 cm) long, smooth or hairy.

Four-petaled flowers, 0.4-0.6 inches (1-1.5 cm) diameter, pink hues, no scent, panicle arrangement.

Slender capsule fruit, splits to release silky-haired seeds for wind dispersal, white or silver fluff.

Upright growth habit, rapid proliferation, capable of dominating local flora, small to moderate blooms.

Distinctive winged stems, green to reddish colors, slender, 0.1-0.2 inches (2.5-5 mm), various branching patterns.

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Care Guide for Willowherbs

Every week

Water

Water: Willowherbs thrives in moist habitats and prefers consistent moisture, tolerating neither drought nor waterlogging. It requires moderate watering, ideally once a week. Growing vigorously outdoors during the rainy season, willowherbs benefits from natural precipitation, reducing the need for supplemental irrigation.

Propagation: Propagation of willowherbs can be achieved through seed sowing, cuttings, or division. Key success factors include moderate light, consistent moisture, and well-drained soil. Minimize root disturbance when dividing or taking cuttings, with sowing requiring stratification and bright, indirect light until germination.

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How to Grow and Care

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Species

Quickly Identify Willowherbs

Care Guide for Willowherbs