Fireweed

Herbaceous

Fireweed

Chamaenerion angustifolium

Also known as: Rosebay Willowherb, Great Willowherb

Herbaceous Onagraceae EdiblePollinatorWildlife AttractorBiomassMulcher
Hardiness Zone
2-8
Ideal Temp
45–72°F
Survives Down To
-40°F
Life Cycle
Perennial

Fireweed (*Chamaenerion angustifolium*) is a tall perennial wildflower of northern and montane regions, famous for colonizing burns and clearings with magenta flower spikes and willow-like leaves. Plants commonly reach 3–6 feet in one season from creeping rhizomes. In subtropical and tropical Americas it is marginal in steamy lowlands—better as a cool microclimate experiment under shade cloth, at elevation in Puerto Rico, or as a winter-active annual-like flush where winters are mild but nights stay cool enough to limit heat stress. 🌞💧 **Sun and Water Requirements:** Full sun in cool climates; in warm subtropical sites give bright partial shade and extra soil moisture without stagnation. Avoid drought in sandy soils; rhizomes spread fastest in moist, open ground. ✂️ **Methods to Propagate:** - **Seeds:** Tiny cottony seeds; surface-sow in cool conditions—many ecotypes need light and fluctuating temperatures to germinate well. - **Rhizome divisions:** Dig and split dormant or early-spring shoots; replant segments with buds. 🧑‍🌾 **When to Harvest:** Young spring shoots can be cooked like asparagus when a few inches tall. Flowers and leaves are used for tea in moderation; pith of older stems has traditional food uses where permitted by local knowledge. Stop picking once plants flower if you want maximum seed for wildlife.

Good Neighbors
  • Alder
  • Lupine
  • Yarrow
Known Threats — Organic Solutions Only
Flea Beetles
Alticini
Powdery Mildew
Erysiphales