OZARK BLUE STAR Flowers Seeds, Amsonia illustris, Shining Blue Star.

Amsonia illustris — Ozark Bluestar or Shining Blue Star — is a native North American perennial prized for three-season interest: terminal clusters of light, star-shaped blue flowers in early-to-mid spring; shiny, willow-like foliage that stays attractive all summer; and a stunning display of golden yellow fall color that rivals ornamental grasses. Grows to 3 feet tall. Prefers moist, loamy soil but adapts well to medium to well-drained conditions. Hardy in USDA Zones 5–9. An outstanding low-maintenance native perennial for borders, naturalized plantings, and rain gardens.

Plant Highlights

• Star-shaped light blue flower clusters in early-to-mid spring — a rare and beautiful native bloom color
• Shiny willow-like foliage stays attractive all summer
• Brilliant golden yellow fall foliage — exceptional three-season ornamental value
• Native North American species — excellent for wildlife and pollinator gardens
• Low maintenance once established; drought-tolerant in well-drained sites
• Hardy in USDA Zones 5–9 | Height: 3 feet | Spacing: 12 inches

Sowing Guide

Stratification (recommended for spring sowing): Mix seeds with moist sand and refrigerate for 60 days before planting. Direct sow stratified seeds after the last spring frost.

Fall sowing (no pre-treatment needed): Direct sow seed in fall with no stratification — seeds will remain dormant through winter and germinate naturally in spring.

Sowing depth: Do not cover seed — surface sow and press lightly. Light is required for germination.

Germination: 15–45 days at 75°F. Keep seeds consistently moist until germination. Thin or transplant seedlings to 12-inch spacing.

Care Guide

Plant in full sun to partial shade. Prefers moist, loamy soil but tolerates medium to well-drained conditions. In semi-shade or rich soil, some pruning or staking may be needed for a tidy, upright habit. Cut back by one-third after flowering to maintain compact shape and prevent sprawl.

Planting Specs

• Common name: Ozark Bluestar, Shining Blue Star
• Botanical name: Amsonia illustris
• Type: Native perennial
• Bloom: Light blue star-shaped clusters
• Bloom time: Early to mid-spring
• Foliage interest: Shiny willow-like summer foliage; golden fall color
• Height: 3 feet | Spacing: 12 inches
• USDA Zones: 5–9
• Light: Full sun to partial shade
• Soil: Sandy, loamy, moist but well-drained
• Sowing depth: Surface sow — do not cover | Germination: 15–45 days at 75°F
• Sowing rate: 4–5 seeds per plant