Rocky Mountain/Water Birch
Betula occidentalis
Rocky Mountain/Water Birch (Betula occidentalis) is a Colorado-native tree suited to the Colorado Front Range, rated "Conditionally Recommended" on the 2024 Front Range Tree Recommendation List. It matures to about 15–25 ft tall and 15–25 ft wide, fast-growing, needs medium to high water, and prefers full sun to partial shade. Best as a multi-stem.
Colorado nativemedium to high water15–25 ft tall and 15–25 ft wide
Photos
- Photo 1: "Betula occidentalis 1" by Stan Shebs is licensed under CC BY-SA 3.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/3.0/.
- Photo 2: "Betula occidentalis 2" by Stan Shebs is licensed under CC BY-SA 3.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/3.0/.
- Photo 3: "Betula occidentalis - water birch" by Matt Lavin is licensed under CC BY-SA 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/2.0/.
- Photo 4: "Pteridium aquilinum - bracken fern and Betula occidentalis - water birch" by Matt Lavin is licensed under CC BY-SA 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/2.0/.
- Photo 5: "Betula occidentalis - water birch" by Matt Lavin is licensed under CC BY-SA 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/2.0/.
- Photo 6: (c) RJ Baltierra, some rights reserved (CC BY)
At a glance
Will it survive here?
- Hardiness zones
- USDA 3–7
- Water needs
- medium to high water
- Sun
- Best in full sun; tolerates partial shade.
- Soil
- clay, loam
- Soil pH
- 6.0–8.2
- Hail tolerance
- moderate
- Wind tolerance
- moderate
- Salt tolerance
- moderate
How big, what shape?
- Mature size
- 15–25 ft tall and 15–25 ft wide
- Mature form
- Oval / upright
- Spacing / clearance
- ~25 ft of clearance
- Growth rate
- Fast
- Lifespan
- Short-lived
What it looks like, and when
- Fall color
- Gold, yellow
- Foliage
- Deciduous
Who else benefits
- Pollinator value
- low
- Colorado native
- Yes
- Native ecoregion
- riparian, foothills
Site factors to consider
- Critical: Insects & DiseasesMain pressure here is Bronze birch borer and Birch leafminer, so keep it vigorous with steady water and a well-chosen site.
- Watch: Short LivedFast but not forever; this one runs short lived here, so enjoy it and plan a successor rather than treating it as a legacy tree.
Common problems on the Front Range
- Bronze birch borer (stress-driven, keep well watered)
- Birch leafminer
These are general tendencies for this group of plants on the Front Range, not a diagnosis. Many are stress-driven and preventable with good siting and watering. For a specific plant or an active problem, consult a certified arborist or your local CSU Extension office.
Frequently asked questions
- Is Rocky Mountain/Water Birch good for the Colorado Front Range?
- Yes, Rocky Mountain/Water Birch is a well-suited tree for Colorado's Front Range, rated "Conditionally Recommended" on the 2024 Front Range Tree Recommendation List.
- Why is Rocky Mountain/Water Birch only conditionally recommended on the Front Range?
- The main catches here: Main pressure here is Bronze birch borer and Birch leafminer, so keep it vigorous with steady water and a well-chosen site.
- How big does Rocky Mountain/Water Birch get?
- It matures to about 15–25 ft tall and 15–25 ft wide.
- How much room does Rocky Mountain/Water Birch need?
- Give Rocky Mountain/Water Birch about 25 ft of clearance from buildings, fences, and other trees so the mature canopy isn't crowded.
- What shape does Rocky Mountain/Water Birch grow into?
- Rocky Mountain/Water Birch typically grows into an upright-oval crown, taller than it is wide. This is the species' usual mature form, named cultivars (columnar, weeping, or compact selections) can differ, so check the specific cultivar.
- Is Rocky Mountain/Water Birch hardy on the Front Range?
- Rocky Mountain/Water Birch is hardy in USDA 3–7. The Colorado Front Range spans roughly USDA 4b–6a, so it is well within range.
- How much water does Rocky Mountain/Water Birch need?
- It needs medium to high water once established.
- How fast does Rocky Mountain/Water Birch grow?
- Rocky Mountain/Water Birch is a fast-growing tree. Growth rate depends on water and site conditions on the Front Range.
- How long does Rocky Mountain/Water Birch live?
- Rocky Mountain/Water Birch is relatively short-lived for a tree, so plan to replace it sooner than a long-lived shade tree. Actual lifespan varies with site, water, and care.
- What color does Rocky Mountain/Water Birch turn in fall?
- Rocky Mountain/Water Birch turns gold and yellow in autumn. Fall color intensity varies with the season and site on the Front Range.
- Is Rocky Mountain/Water Birch native to Colorado?
- Yes. It is a Colorado native.
- Is Rocky Mountain/Water Birch prone to pests or disease on the Front Range?
- Rocky Mountain/Water Birch can be affected by bronze birch borer (stress-driven and other issues common to this group on the Front Range. These are general tendencies, not a diagnosis, many are stress-driven and preventable with good siting and watering. For a specific plant or an active problem, consult a certified arborist or CSU Extension.
