2 links
Las Pilitas: California Penstemons
laspilitas.com
Two pages with pictures, brief descriptions, and cultural requirements of penstemons native to California, for dry-area and moist-area species.
The Penstemons: Seed Germination Methodology
tomclothier.hort.net
Two pages in Tom Clothier's extensive plant germination database dedicated exclusively to penstemon species, which are often finnicky and require a wide variety of germination cond…
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