Fireweed Plant Care

Fireweed (Erechtites valerianifolius) belongs to the Asteraceae family within the Erechtites genus. Fireweed is native to Mexico, Central America, South America, and the West Indies. Fireweed is also known as Indian Groundsel, California Burweed, Crassocephalum valerianifolium.

Fireweed displays a tall, upright annual growth habit, reaching up to 3 ft tall with a spread of approximately 1.5 ft. Fireweed produces small, greenish-white flowers in clusters.

Leaf size: approximately 4 inches.

Erechtites valerianifolius requires watering every 3–5 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Fireweed thrives in full sun to partial shade.

Erechtites valerianifolius grows best at temperatures of 60–80°F. Fireweed prefers humidity levels of 40–60%.

Moist, well-draining soil rich in organic matter. Good drainage is essential for Fireweed to prevent waterlogging, which leads to root rot and fungal issues.

Feed Fireweed every 4 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Repot annually in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Fireweed can be propagated through seeds.

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Fireweed is susceptible to aphids, spider mites, whiteflies. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Fireweed grows outdoors in USDA Zone 10a – 12b. It survives winters down to planting zone 10a. Fireweed is native to Mexico, Central America, South America, and the West Indies. In cooler regions, grow Fireweed as a houseplant or bring it indoors before the first frost.