Trachelium caeruleum (Blue Throatwort): Long-Blooming Cut Flower

Blue Throatwort: Dome-Shaped Blooms for Borders and Bouquets

Trachelium caeruleum, known as blue throatwort, bears dome-shaped flower heads several inches across, crowded with tiny tubular amethyst or white flowers reminiscent of allium blooms. Its lance-shaped, toothed leaves show hues of cordovan purple or deep green brushed with plum. Though perennial, it performs beautifully as an annual, blooming from summer to fall.

Plant Profile

• Height: 1 to 3 feet
• Spread: 1 to 3 feet
• Growth Habit: Clumping
• Light: Full sun (with afternoon shade in hot climates)
• Moisture: Medium, well-drained soil
• Maintenance: Low
• Bloom Time: Summer through early fall
• Flower Colors: Blue, purple, white
• Special Features: Excellent cut flowers, attracts songbirds and butterflies, showy foliage

Growing Tips

Provide neutral to slightly acidic, well-drained soil in full sun, with some shade during the hottest part of the day. Sow seeds in a cold frame when ripe or at 55–60°F in spring. Root cuttings can be overwintered in a protected location. Monitor for aphids and spider mites.