Botanical Name: Bupleurum rotundifolium
Native: North Africa, Asia, and Europe
Hardiness: May be perennial in USDA zones 10 and warmer; usually grown as an annual.
Plant Dimensions: 24"–36" tall, 12"–24" wide
Variety Information: 2½" clusters of yellow flowers in umbels, surrounded by green to lime-green petal-like bracts
Exposure: Full sun
Bloom Period: Summer to frost
Attributes: Cut Flower
When to Sow Outside: RECOMMENDED. 2 to 4 weeks before your average last frost date or in late summer.
When to Start Inside: 4 to 6 weeks before your average last frost date. Roots are sensitive to disturbance; sow in biodegradable pots that can be planted in the ground.
Days to Emerge: 7–30 days
Seed Depth: Press seed into soil surface
Seed Spacing: A group of 3 seeds every 12"
Thinning: When 2" tall, thin to 1 every 12"