Houstonia longifolia
long-leaved bluets
Overview
Houstonia longifolia is a small, clump-forming perennial reaching 4-12 inches (10-30 cm) tall, with several slender, wiry, upright stems from a tufted base. The narrow, linear to lance-shaped leaves are 0.5-1.5 inches (1-4 cm) long, opposite, and stalkless, with a basal rosette that may wither by bloom. Loose clusters of small four-lobed flowers 0.2-0.3 inch (5-8 mm) across open at the stem tips, pale purple, lilac, or white with a paler or yellowish throat. Bloom runs from late spring into summer, followed by small two-lobed seed capsules. Growth is modest, and plants form low tufts rather than spreading mats. It grows on dry, lean, often rocky or sandy soils where taller plants thin out, and the slender stems can be lost among coarser neighbors. Foliage may brown and die back in late-summer drought.
Native Range
Native to eastern and central North America, from Quebec and Ontario south to Georgia and west to the Great Plains. Grows in dry open woods, rocky slopes, bluffs, glades, and sandy clearings on well-drained, low-nutrient soils.Suggested Uses
Planted in rock gardens, gravel gardens, dry native plantings, and the front edge of lean borders, spaced 6-10 inches (15-25 cm) apart. The small flowers draw native bees and other small pollinators. Its low size and need for open, lean ground make it unsuited to rich borders or sites crowded by vigorous perennials.How to Identify
Appearance
Size & Dimensions
Height4" - 1'
Width/Spread4" - 8"
Bloom Information
Detailed Descriptions
Flower Description
pale purple to whiteFoliage Description
greenGrowing Conditions
Sun Requirements
Requires 5-10 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Grows in full sun to light shade on dry, sharp-draining, lean rocky or sandy soil and tolerates drought once established. Rich, moist, or shaded sites cause weak, sparse growth and fewer flowers. Water lightly through the first season to establish, then little is needed. The plant is short-lived but self-sows where soil stays open, keeping a patch going. Few pests trouble it. Crowding by larger plants and dense mulch smother the low tufts.Pruning
No routine pruning is needed. Spent flower stems can be sheared after bloom to tidy the clump and may bring a light rebloom. Leaving some seedheads allows self-sowing to renew the patch.Container Growing
✓ Suitable for container growing
Minimum container size: 1 gallons