Arizona Summer Poppy-caltrops is a sprawling wildflower native to the American Southwest that brings intense, sun-loving color to summer gardens when heat peaks. The plant produces eye-catching yellow flowers with striking red-orange centers that bloom prolifically for weeks, thriving in conditions that would exhaust most ornamentals. A true heat lover, it performs best when planted in spring or summer and rewards gardeners with continuous blooms through the warmest months. This variety supports conservation efforts, as seed sales benefit Native Seeds/SEARCH's work preserving the Southwest's botanical heritage.
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The flowers glow with a distinctive golden yellow petals surrounding deep red-orange centers, creating a two-tone intensity that catches the eye from across the garden. Unlike many flowers that fade or stop blooming during peak summer heat, Arizona Summer Poppy-caltrops accelerates its flowering in intense conditions, making it invaluable for southwestern gardens where other annuals wilt. The sprawling growth habit and weeks-long bloom window turn this native wildflower into a reliable source of color when the heat is most relentless.
Arizona Summer Poppy-caltrops is grown primarily as an ornamental wildflower, valued for adding native color and ecological authenticity to desert and xeriscape gardens. Its prolific summer blooming makes it excellent for naturalistic plantings, pollinator gardens, and landscape designs that celebrate Southwest native plants. The plant also serves an educational role in conservation-minded gardens, connecting gardeners to the region's natural botanical heritage.
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Sow seeds directly in spring or summer into warm soil in full sun. Scatter seeds on prepared ground and press gently into contact with soil; warmth will trigger germination.
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“Kallstroemia grandiflora is a native wildflower of the American Southwest, naturally adapted to the region's demanding climate. Native Seeds/SEARCH, a nonprofit seed conservation organization based in Tucson, Arizona, has preserved and distributed this variety as part of their mission to conserve the botanical heritage of the desert Southwest and support indigenous seed-saving traditions. By offering this seed, they ensure that gardeners can access plants with deep roots in the regional landscape while directly supporting their conservation work.”