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Asclepias fascicularis, commonly known as narrowleaf milkweed, is a herbaceous perennial plant valued for its slender foliage and upright growth habit. It develops narrow, elongated leaves along branching stems and produces clusters of small flowers during the growing season. This species is adapted to warm and temperate climates and performs best in full sun with well-drained soil. It is commonly used in naturalized planting, borders, and open landscapes, where it establishes steadily from seeds under suitable conditions and tolerates dry environments once established.
Features
- Upright perennial with slender, narrow leaves
- Produces clusters of small flowers
- Suitable for naturalized areas and open landscapes
- Adapted to sunny and dry conditions
- Establishes reliably from seeds
Specifications
- Scientific name: Asclepias fascicularis
- Common name (US): Narrowleaf Milkweed
- Seed type / variety: Standard variety
- Growth habit: Upright, herbaceous perennial
- USDA zones: 6-10
- Planting season: Fall or early spring
- Growing season: Spring to summer
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Sowing Season:
- Fall: September to November
- Early Spring: February to March
- Germination time and conditions: 2-4 weeks at 18-24°C; cold stratification may improve germination
- Sunlight requirements: Full sun
- Soil requirements: Well-drained soil, tolerant of sandy or dry soils
- Watering needs: Low to moderate once established
- Mature plant size: 60-120 cm height, 30-60 cm spread
- Plant spacing: 30-45 cm between plants
