Rock Garden Plants
Penstemon  retrorsus Pennell  sect. Caespitosi 
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FamilyPLANTAGINACEAE
Genus species var.Penstemon  retrorsus Pennell  sect. Caespitosi
Territory Northwestern U.S.A.Colorado
rocky slopes
Altitude2000-2100m
Description cinereous, leaves oblanceolate or spathulate, 8-15mm, flowers 15-20mm in interrupted spike, corolla tubular, staminodium apically densely barbate
Size10-20cm
Colorblue
Bloomsummer
Ca
Typesubshrub, carpet
Cultivationsunny, dry, rock crevices, protection against winter wet
alpine house, poor, drained soil, sun
Propagationseed in spring, barely covered, germ. 1-3 months, 13-18°C
cuttings in late summer
Bibliography
USDA Plants Database plants.usda.gov
Version 8.0
(c) 1990-2016 RNDr. Pavel Slabý