This hybrid false indigo with its strong Baptisia australis influence was selected for its incredibly saturated, dark violet-purple flowers on a plant that otherwise resembles B. australis in vigor, size, and habit. Plants bloom for three weeks commencing in mid- May (USDA Zone 5). The inch-wide flowers are produced on 18’’-long inflorescences, which may be partially hidden in the foliage in warmer zones. Plants are cloaked with attractive blue-green foliage all summer. ‘Royal Purple’ may lodge in shade or on overly fertile soils, and is for full sun only. This complex hybrid was developed mainly from B. australis, and secondarily from B. bracteata and B. sphaerocarpa.
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The Prairieblues™ false indigos were developed by Jim Ault, Ph.D., at the Chicago Botanic Garden from crosses made between 1999 and 2004. The selections were developed from crossing Baptisia albescens (formerly B. alba), B. australis var. australis, B. australis var. minor, B. bracteata (formerly B. leucophaea), B. sphaerocarpa, and B. tinctoria in various c ombinations. All parent plants and selections were grown in-ground at the Chicago Botanic Garden (USDA Zone 5b) during the breeding and selection process.
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Mobile, Alabama 36640