How to Grow Epilobium Plants in your Garden

Gardener's HQGuide to Growing Willoherb, Fireweed, French Willow, and Spike-primrose

Epilobium are hardy and half hardy perennials that usually flower in the middle of summer.

Due to being a very large genus of plants, plant sizes are very variable, though gardeners tend to like the smaller (10 to 20 cm) and larger (120 to 150 cm) varieties.

The smaller species usually grow in clumps and have funnel shaped flowers of red; the larger varieties of Epilobium have small flowers of white or pink.

Some of the common names for Epilobium members include French Willow, Rosebay, Fireweed and Willow herb.

How to grow French Willow and other Epilobium Plants in the Garden

It is best to grow French willow and other Epilobium plants outdoors in flats. The seeds should be planted at a depth of about 3 mm in the autumn using fresh seeds; the flats should then be covered with glass and be placed against a north facing shed or wall in the garden.

Once seedlings emerge in the spring they should be allowed to grow for 6 or 7 weeks and then transplanted at a spacing of 30 cm (small) to 60 cm (large) into a sunny or lightly shaded area of the garden.

Members of Epilobium such as the French willow prefer to grow in a soil that is of a stony and dry nature with a slightly acidic soil of pH 6 to 7.

Caring for Epilobium

Once established French Willow and other Epilobium will pretty much look after themselves, perhaps a little too well, so dead head Epilobium after flowering to prevent them from self-seeding and taking over the garden.

I hope that you enjoyed this guide on how to grow Epilobium plants. Updated September 2020.