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
· 4 counties across 1 state§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 4 counties across 1 state.
Montana view state ↗ 4 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-2026-05-25
fetched 2026-05-25T18:27:19Z