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Botanical Name: Lupinus spp.
Mature Size: 103 ft H, 102 ft W
Light Requirement: Sun
Water Need: Low to Medium
Cold Hardiness: Zone 4 (030F) to Zone 9 (20 to 30F)
Description: Cool-season perennials and annuals known for showy, spiked flower clusters in shades of blue, purple, pink, and white. Native and adapted varieties perform best in spring and early summer, especially when grown in full sun and lean, well-drained soils. These nitrogen-fixing plants enrich the soil, making them excellent companions in native and wildflower gardens. Palm-shaped foliage adds unique texture, and blooms attract pollinators like bees and butterflies. Treated as annuals or reseeding perennials as summer heat can limit long-term performance.
Common and Unusual Varieties:
Texas Bluebonnet: State flower of Texas, this annual lupine produces iconic blue flower spikes in spring. Native, thrives in poor soils, and reseeds readily.
Sundial Lupine: Native to the eastern U.S., this perennial has lavender-blue flowers and is a larval host plant for some butterfly species. Prefers sandy or loamy soils.
Bigleaf Lupine: Tall, perennial variety with bold flower spikes. Best suited for cooler climates but can be grown as a spring annual in Austin.
Sandyland Bluebonnet: Slightly smaller, with lighter blue flowers. Naturally found in sandy soils of East Texas; grows well in loose, well-draining soil. Big Bend Bluebonnet: Taller and more striking, with large flower spikes. Native to West Texas but can be grown in Austin with proper soil and drainage.
Maroon Bluebonnet (Alamo Fire): A cultivated variety with deep maroon-red blooms. Developed by Texas A&M for ornamental use and visual contrast in wildflower mixes.
White Bluebonnet (Snowy): Pure white-flowered selection. Best used in mixes or accents for contrast.