Amsonia × 'String Theory' (Blue Star 'String Theory') is a compact selection valued for its fine, threadleaf texture and dependable, powdery blue spring flowers. You get a neat, mounded clump that looks soft and airy through summer, then finishes the season with standout golden fall color.

Plant it in full sun for the best flowering and strongest fall color, or give it part shade where summers run hot. In too much shade the stems can open up and flop, so choose a bright site with good air circulation and room for it to mature. It pairs especially well with bold-leaved perennials and ornamental grasses, where its narrow foliage adds contrast.

Grow it in average, well-drained soil and keep it evenly moist during establishment. Once rooted in, it will handle short dry spells, but it looks best with occasional deep watering during extended drought. A light mulch helps conserve moisture, but keep mulch pulled back from the crown. If you want a tighter, more upright habit, you can shear or cut it back after flowering.

Expect a mature size around 18-22 inches tall and 32-36 inches wide. Use it in borders, rock gardens, open woodland edges, and mass plantings for a calm, repeating texture. The blooms are attractive to butterflies, and deer tend to avoid it.

Specifications

• Cold hardiness zone: 5-8 (-20 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Growth rate: Slow
• Mature height: 18-22"
• Spread: 32-36"
• Tolerant of: Deer, Drought
• Attracts: Butterflies
• Native to the U.S.: Yes

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