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Product Description
Bring graceful color and texture to your garden with Amsonia Hubrichtii Flower Seeds. Known for their delicate blue star-shaped flowers and fine, feathery foliage, these plants offer a long blooming season, making them a beautiful addition to borders, cottage gardens, and mixed perennial beds.
Produces delicate, star-shaped blue flowers
Long bloom season for extended garden color
Ideal for borders, cottage gardens, and mixed perennial beds
Easy to grow and maintain
Adds texture, color, and elegance to home gardens
Type: Perennial flowering plant
Bloom Time: Late spring through early summer
Height: 18–30 inches (approx.)
Spacing: 12–18 inches apart
Light Requirements: Full sun to partial shade
Zones: USDA Zones 5–9
Soil Preparation: Use well-drained soil with moderate moisture.
Sowing: Sow seeds indoors 8–10 weeks before the last frost, or directly outdoors after frost. Lightly cover seeds with soil.
Watering: Keep soil evenly moist until seedlings are established. Water moderately once grown.
Germination: Seeds typically sprout within 2–3 weeks; cold stratification may improve germination.
Care: Thin seedlings to proper spacing. Remove spent flowers to encourage continued blooming.
Seasonal Guide:

Life Cycle
Perennial flower
Planting Season
Cool season
Growth Habit
Upright clumping
Flavor Profile
Not edible
Plant Characteristics
Fine blue stars
Use
Border planting
Growing Conditions
Sunny well-drained soils
Harvest Advantages
Long bloom season
Plant Resistance
Drought tolerant
Scientific Name: Amsonia hubrichtii
Seed Names
Amsonia hubrichtii
Seed Type
Heirloom non-GMO
Amsonia hubrichtii, commonly known as Threadleaf Bluestar, is an elegant heirloom perennial valued for its soft blue spring flowers and fine, feathery foliage. With a naturally long bloom season and excellent garden reliability, this non-GMO plant thrives in sunny home gardens and adds graceful texture and color to borders and perennial beds.
Light Requirement
Full sun partial
Planting Depth
Surface sowing
Sowing Method
Direct sowing
Plant Spacing
18–24 inches
Days to Maturity
18–24 inches
Soil Preparation
Cold stratification
Hardiness Zones
USDA 4–9
Water Needs
Moderate moisture
Planting Season
Spring or fall
Seed Count
Recommended Coverage
100
Up to 25 sq ft
500
Up to 125 sq ft
1000
Up to 250 sq ft