Index / Search / Penstemon rydbergii
§1 Plant
Penstemon rydbergii A. Nelson
vernacular Rydberg's penstemon — species · Scrophulariaceae
§2Habit & range
Habit and range
- Growth habit
- Forb/herb, Subshrub
- Duration
- Perennial
- Group
- Dicot
- Family
- Scrophulariaceae Juss.
- Genus
- Penstemon
§2a
Native status, by region
- L48 Lower 48 States Native
§2b
County-level range
· 137 counties across 11 states/territories§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Low
- Shade
- High
- Moisture use
- Low
- Fire
- Medium
- Salinity
- None
- Anaerobic
- None
- CaCO₃
- Low
§3b
Climate & soil
- Cold tolerance
- -38 °F minimum
- Frost-free days
- 130 min.
- Precipitation
- 20–30 in/yr
- pH range
- 6–8
- Root depth
- 14 in min.
- Fertility need
- Medium
- Soil texture
- medium, fine
§3c
Form & growth
- Growth form
- Bunch
- Growth rate
- Moderate
- Lifespan
- Moderate
- Mature height
- 3 ft
- Foliage texture
- Medium
- Foliage colour
- Green
- Porosity (summer)
- Porous
- Porosity (winter)
- Porous
- Flower colour
- Blue
- Fruit colour
- Brown
- Fire resistant
- No
- N fixation
- None
- Toxicity
- Slight
§3d
Reproduction
- Bloom period
- Mid Summer
- Seed abundance
- Medium
- Seed begins
- Summer
- Seed ends
- Fall
- Spread rate
- Slow
- Stratify
- No
- Seeds / lb
- 131,900
- Propagation
- seed
§3e
Use & availability
- Commercial availability
- Routinely Available
- Nursery stock
- No
- Browse palatability
- Medium
- Graze palatability
- Low
- Palatable, human
- No
- Protein potential
- Low
- Lumber
- No
- Christmas tree
- No
§4Counties, by state
Recorded in 137 counties across 11 states/territories.
Arizona view state ↗ 2 N ▾
California view state ↗ 23 N ▾
- Alpine 06003
- Butte 06007
- Calaveras 06009
- El Dorado 06017
- Fresno 06019
- Glenn 06021
- Inyo 06027
- Lake 06033
- Lassen 06035
- Madera 06039
- Mariposa 06043
- Mendocino 06045
- Modoc 06049
- Mono 06051
- Nevada 06057
- Placer 06061
- Plumas 06063
- Shasta 06089
- Sierra 06091
- Siskiyou 06093
- Tehama 06103
- Trinity 06105
- Tuolumne 06109
Colorado view state ↗ 23 N ▾
- Archuleta 08007
- Chaffee 08015
- Clear Creek 08019
- Delta 08029
- Garfield 08045
- Gilpin 08047
- Grand 08049
- Gunnison 08051
- Hinsdale 08053
- Jackson 08057
- Lake 08065
- Larimer 08069
- Mesa 08077
- Mineral 08079
- Moffat 08081
- Montezuma 08083
- Park 08093
- Pitkin 08097
- Routt 08107
- Saguache 08109
- San Juan 08111
- Summit 08117
- Teller 08119
Idaho view state ↗ 19 N ▾
Montana view state ↗ 4 N ▾
Nevada view state ↗ 12 N ▾
New Mexico view state ↗ 4 N ▾
Oregon view state ↗ 20 N ▾
Utah view state ↗ 22 N ▾
Washington view state ↗ 6 N ▾
Wyoming view state ↗ 2 N ▾
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/PERY ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/3171536 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T20:46:58Z