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The Penstemons: Seed Germination Methodology - http://tomclothier.hort.net/page08.html
Two pages in Tom Clothier's plant germination database dedicated exclusively to penstemon species, which are often finnicky and require a wide variety of germination conditions. |
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The Penstemon Website - http://www.biosci.ohio-state.edu/~awolfe/Penstemon/Penstemon.html
Enthusiast's collection of links, information (both for gardeners and botanists), and photographs of penstemon species and varieties. |
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Kemper: Penstemon digitalis - http://www.mobot.org/gardeninghelp/plantfinder/Plant.asp?code=G590
Plant portrait of foxglove beardtongue with cultural information, photos, and noteworthy characteristics. |
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Las Pilitas: California Penstemons - http://www.laspilitas.com/groups/penstemon/california_penstemon.html
Two pages with pictures, brief descriptions, and cultural requirements of penstemons native to California, for dry-area and moist-area species. |
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Paghat's Garden: 'Bashful' Beard-tongue - http://www.paghat.com/penstemonbashful.html
One of a series of plant portrait pages documenting penstemons in this Pacific Northwest garden. Varieties featured are 'Bashful', 'Prairie Dusk', 'Midnight Blue', 'Ruby', 'Apple Blossom', 'Sour Grapes', and 'Garnet'. |