Heterotheca subaxillaris
Heterotheca subaxillaris · Asteraceae
The gardener's calendar
Ideal time to plant heterotheca subaxillaris: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Bristly oxtongue or Camphor weed
- Family
- Asteraceae
- Type
- Annual or biennial herb
- Adult height
- 60 to 120 cm tall
- Flowering
- August to November
- Hardiness
- Moderate, prefers temperate to warm climates
- Origin
- North America (southeastern United States)
- Foliage
- Deciduous, lanceolate to linear leaves
Care
Exposure and climate
Heterotheca subaxillaris thrives in full sun, ideally 6 to 8 hours per day. It tolerates hot and dry areas but also appreciates light shade in very hot climates. Planted in a sheltered location away from wind, it will maintain a more compact habit.
Soil preparation
This plant prefers well-drained soil, even poor or stony. Avoid overly moist or clayey soil which promotes rot. Light, sandy or chalky soil suits its growth perfectly.
Watering
Water moderately during the growing season, especially during prolonged dry spells. Once established, the plant tolerates dry periods well. During cold months, reduce watering significantly to prevent rot.
Nutrition
A balanced fertilizer application in spring is generally sufficient. Heterotheca subaxillaris is not particularly demanding; excess nitrogen would promote excessive leaf growth at the expense of flowering. In very poor soil, light mineral fertilizer can be beneficial.
Pruning and maintenance
Pinch young plants in spring to encourage branching. After flowering, you can cut the plant back to stimulate new flower production. Regularly remove spent flowers to prolong blooming.
Pests and diseases
Heterotheca subaxillaris is relatively robust. Watch for aphids and spider mites in hot, dry conditions. Powdery mildew can appear with excessive humidity or poor air circulation; improve ventilation to prevent this issue.
Did you know?
Heterotheca subaxillaris is native to the dry lands of the southeastern United States, historically used by indigenous peoples and pioneers for its diuretic and anti-inflammatory properties. Its genus name, Heterotheca, means 'different container', referring to the particular structure of its flower heads which combine central tubular florets and peripheral ligulate florets typical of the Asteraceae family.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- SunflowerHelianthus annuus
- YarrowAchillea millefolium
- Ox-eye daisyLeucanthemum vulgare
- SneezewortAchillea ptarmica
- Canadian goldenrodSolidago canadensis
- WormwoodArtemisia absinthium
Tips generated and checked by Viridia — adapt them to your local climate.