120 Days to maturity. Penstemon strictus. Rocky Mountain Penstemon Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, perennial. Rocky Mountain penstemon is easy to grow from seed and ideal for gardens prone to heat and drought across North America. Rocky Mountain penstemon is native to arid pine and juniper forests from Wyoming down to New Mexico and is a tenacious performer in poor soil. Rocky Mountain penstemon flowers are fragrant and simple to grow whether it be indoors or out for compact, urban, or traditional gardens alike. Rocky Mountain seeds promise neat penstemon plants with rich, leafy greens and robust "snapdragon-like" stalks certain to excite any fresh cut arrangement, basket, or bouquet.