Chamaenerion angustifolium is a perennial herbaceous flowering plant in the willowherb family Onagraceae. It is known in North America as fireweed, in some parts of Canada as great willowherb, in Britain and Ireland as rosebay willowherb. In the United Kingdom it is also known as bombweed, as a result of its rapid appearance on city bomb sites during the Blitz of World War II; the plant is also traditionally known as Saint Anthony's laurel.: 112 It is also known by the synonyms Chamerion angustifolium and Epilobium angustifolium. It is native throughout the temperate Northern Hemisphere, including large parts of the boreal forests.
Fireweed has strong resistance to disease and is typically not vulnerable to illnesses. Still, it can be affected by pests and diseases present in its environment. These infections are generally not severe. Care-wise, the plant needs a moderate amount of maintenance. It should be pruned regularly to preserve a good appearance and support healthy growth. Fertilizing can also help encourage flowering. Fireweed is well suited for anyone with outdoor space, such as a garden or patio, and does not demand extensive plant-care experience. It may need more attention when grown indoors.
How to keep Chamerion Angustifolium.
Light
Fireweed prefers partly sunny conditions but can also tolerate full sun or complete shade. Coming from habitats with variable sunlight exposure, it is usually undemanding when it comes to light needs.
Temperature
Fireweed is native to cool environments and prefers temperatures between 41 and 95 ℉ (5 to 35 ℃). It can tolerate colder temperatures but not extreme heat. In hotter months it may require more frequent watering and shade to avoid high temperature stress.
Fertilizer
One fertilizer application in spring is typically enough for Fireweed, though several feedings can maximize growth. Apply fertilizer every month to six weeks. Fertilization improves the leaves' appearance and performance, helping maintain consistent color and a healthy texture. It also promotes root development and nutrient uptake, supporting the plant's long-term health.
Pot & Repot
When repotting Fireweed, pick a pot 1-2 inches (2.5–5.1 cm) larger that has good drainage. Use a well-draining potting mix. Repot in spring or fall, making sure the root ball sits slightly below the rim of the flower pot. Water thoroughly after repotting and place the pot in a warm location with indirect sunlight.
Botanical profile.
- Plant Type
- Herb
- Life Cycle
- Perennial
- Genus
- Chamerion
- Family
- Onagraceae
- Hardiness Zone
- 4-9
- Mature Height
- 0.61 m to 1.52 m
- Mature Spread
- 40 cm
- Leaf Color
- Green, Dark Green
- Leaf Type
- Deciduous
- Flower Color
- Purple, White, Pink, Red
- Flower Size
- 2.54 cm
- Bloom Time
- Summer
- Planting Time
- Spring, Summer, Autumn
- Harvest Time
- Late summer, Early fall, Mid fall
Other names.
