saxifrage
Saxifraga hirsuta
saxifrage (Saxifraga hirsuta) is a perennial suited to the Colorado Front Range. It matures to about 6 in tall and 6 to 12 in wide, needs high water, and prefers full sun to partial shade. Fire-wise zone 1-2 perennial; CSU 6.305 score 8.0 of 10.
On the CSFS firewise listhigh water6 in tall and 6 to 12 in wideLow ignitability: OK 0-30 ft from the house, CSU score 8/10
Photos
- Photo 1: (c) Jose Castro, some rights reserved (CC BY)
- Photo 2: Ghislain118 http://www.fleurs-des-montagnes.net, Wikimedia Commons (CC-BY-SA)
- Photo 3: (c) Rafael Medina, some rights reserved (CC BY)
- Photo 4: Secundum naturam, Wikimedia Commons (PD)
- Photo 5: Tournasol7, Wikimedia Commons (CC-BY-SA)
At a glance
Will it survive here?
- Hardiness zones
- USDA 4 to 8
- Water needs
- high water
- Sun
- Best in full sun; tolerates partial shade.
- Soil
- clay, loam, sandy
- Soil pH
- 6.5 to 8.0
- Hail tolerance
- high
- Wind tolerance
- high
- Salt tolerance
- moderate
- Site uses
- Slopes & erosion control
How big, what shape?
- Mature size
- 6 in tall and 6 to 12 in wide
- Planting spacing
- ~8 to 12 in apart
What it looks like, and when
- Bloom time
- mid spring, early summer
- Bloom color
- white
- Bloom length
- Long (several weeks)
- Foliage
- Deciduous
Who else benefits
- Pollinator value
- high
- Deer
- Not rated
- Colorado native
- No
Also worth knowing
- Fire rating
- Low ignitability: OK 0-30 ft from the house, CSU score 8/10
Planting & establishment
Deep-water first season to establish, then minimal water needed.
Frequently asked questions
- Is saxifrage good for the Colorado Front Range?
- Yes, saxifrage is a well-suited perennial for Colorado's Front Range.
- How big does saxifrage get?
- It matures to about 6 in tall and 6 to 12 in wide.
- How far apart do I plant saxifrage?
- Space saxifrage about 8 in apart for a faster, fuller bed, or up to 12 in apart for a looser planting.
- Is saxifrage hardy on the Front Range?
- saxifrage is hardy in USDA 4 to 8. The Colorado Front Range spans roughly USDA 4b to 6a, so it is well within range.
- How much water does saxifrage need?
- It needs high water once established.
- Is saxifrage native to Colorado?
- No. It is not a Colorado native, but it grows well on the Front Range.
- Is saxifrage a good firewise plant near the house?
- saxifrage is rated 8 of 10 in CSU Extension Fact Sheet 6.305 (2025), where higher means less ignitable, so it can go within 0 to 5 feet of the house as well as out to 30 feet when kept watered and tidy. This is general guidance based on CSU Extension Fact Sheet 6.305 (2025), 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 saxifrage bloom?
- saxifrage blooms for several weeks, a long-season performer on the Front Range. Bloom timing shifts a week or two with elevation and spring weather.
