Rocky Mountain Penstemon
Penstemon strictus
Rocky Mountain Penstemon (Penstemon strictus) is a Colorado-native perennial suited to the Colorado Front Range. It matures to about 30 in tall and 24 in wide, needs low to medium water, and prefers full sun to partial shade. CO native perennial; supports pollinators.
Colorado nativeOn the CSU listlow to medium water30 in tall and 24 in wideXeric / water-wiseDeer-resistant
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At a glance
- Botanical name
- Penstemon strictus
- Type
- Perennial
- Mature size
- 30 in tall and 24 in wide
- Planting spacing
- ~17–24 in apart
- Bloom length
- Long (several weeks)
- Hardiness zones
- USDA 3–8
- Water needs
- low to medium water
- Sun
- Best in full sun; tolerates partial shade.
- Colorado native
- Yes
- Foliage
- Deciduous
- Soil
- clay, loam, sandy
- Soil pH
- 6.5–8.0
- Hail tolerance
- high
- Wind tolerance
- high
- Salt tolerance
- moderate
- Firewise (defensible space)
- Zones 1–3 (can be planted near the house)
- Bloom color
- blue, purple
- Bloom time
- late spring, early summer
- Pollinator value
- high
- Site uses
- Slopes & erosion control
Wildlife & ecology
- Pollinator value
- high
- Deer
- Generally deer-resistant
- Native ecoregion
- shortgrass prairie, foothills
Planting & establishment
Native perennial; deep-water first season to establish, then minimal water needed.
Frequently asked questions
- Is Rocky Mountain Penstemon good for the Colorado Front Range?
- Yes, Rocky Mountain Penstemon is a well-suited perennial for Colorado's Front Range.
- How big does Rocky Mountain Penstemon get?
- It matures to about 30 in tall and 24 in wide.
- How far apart do I plant Rocky Mountain Penstemon?
- Space Rocky Mountain Penstemon about 17 in apart for a faster, fuller bed, or up to 24 in apart for a looser planting.
- Is Rocky Mountain Penstemon hardy on the Front Range?
- Rocky Mountain Penstemon is hardy in USDA 3–8. The Colorado Front Range spans roughly USDA 4b–6a, so it is well within range.
- How much water does Rocky Mountain Penstemon need?
- It needs low to medium water once established.
- Is Rocky Mountain Penstemon native to Colorado?
- Yes. It is a Colorado native.
- Is Rocky Mountain Penstemon deer-resistant?
- Rocky Mountain Penstemon is generally considered deer-resistant, though no plant is deer-proof when browse pressure is high.
- Is Rocky Mountain Penstemon a good firewise plant near the house?
- Rocky Mountain Penstemon is a lower-fuel choice suitable in defensible-space zones 1–3, it can be planted near the house when kept well irrigated and maintained. This is general suitability guidance based on CSU Extension firewise plant lists, not a guarantee that any plant won't burn, a well-irrigated, well-maintained plant is the goal. Follow CSU Extension defensible-space guidance and check with your local fire district before planting in the wildland-urban interface.
- How long does Rocky Mountain Penstemon bloom?
- Rocky Mountain Penstemon blooms for several weeks, a long-season performer on the Front Range. Bloom timing shifts a week or two with elevation and spring weather.
