Green Giant
Thuja standishii x Thuja plicata
Green Giant (Thuja standishii x Thuja plicata) is a tree suited to the Colorado Front Range, rated "Recommended for Most Sites" on the 2024 Front Range Tree Recommendation List. It matures to about 40–60 ft tall and 12–18 ft wide, needs medium to high water, and prefers full sun to partial shade. Needs protected area.
medium to high water40–60 ft tall and 12–18 ft wideDeer-resistant
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At a glance
- Rating
- Recommended for Most Sites
- Botanical name
- Thuja standishii x Thuja plicata
- Variety / cultivar
- Green Giant
- Type
- Tree
- Mature size
- 40–60 ft tall and 12–18 ft wide
- Mature form
- Pyramidal
- Spacing / clearance
- ~18 ft of clearance
- Hardiness zones
- USDA 2–8
- Growth rate
- Moderate
- Lifespan
- Long-lived
- Water needs
- medium to high water
- Sun
- Best in full sun; tolerates partial shade.
- Colorado native
- No
- Foliage
- Evergreen
- Soil
- clay, loam
- Soil pH
- 6.0–8.2
- Hail tolerance
- high
- Wind tolerance
- high
- Salt tolerance
- moderate
- Pollinator value
- low
Site factors to consider
- Watch: Leaf ScorchIts leaf edges brown in hot, dry wind, so give it steady summer water and some shelter from the worst afternoon blast.
Wildlife & ecology
- Pollinator value
- low
- Deer
- Generally deer-resistant
Frequently asked questions
- Is Green Giant good for the Colorado Front Range?
- Yes, Green Giant is a well-suited tree for Colorado's Front Range, rated "Recommended for Most Sites" on the 2024 Front Range Tree Recommendation List.
- How big does Green Giant get?
- It matures to about 40–60 ft tall and 12–18 ft wide.
- How much room does Green Giant need?
- Give Green Giant about 18 ft of clearance from buildings, fences, and other trees so the mature canopy isn't crowded.
- What shape does Green Giant grow into?
- Green Giant typically grows into a pyramidal, conical outline that is widest at the base. This is the species' usual mature form, named cultivars (columnar, weeping, or compact selections) can differ, so check the specific cultivar.
- Is Green Giant hardy on the Front Range?
- Green Giant is hardy in USDA 2–8. The Colorado Front Range spans roughly USDA 4b–6a, so it is well within range.
- How much water does Green Giant need?
- It needs medium to high water once established.
- How fast does Green Giant grow?
- Green Giant is a moderate-growing tree. Growth rate depends on water and site conditions on the Front Range.
- How long does Green Giant live?
- Green Giant is long-lived, a multi-generational tree given good siting and care. Actual lifespan varies with site, water, and care.
- Is Green Giant native to Colorado?
- No. It is not a Colorado native, but it grows well on the Front Range.
- Is Green Giant deer-resistant?
- Green Giant is generally considered deer-resistant, though no plant is deer-proof when browse pressure is high.
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See also
Related trees
Eastern Arborvitae: Emerald, Techny, Degroots Spire, North Pole
Thuja occidentalis
Maple, Red: Autumn Flame, REDPOINTE®, RED SUNSET®
Acer rubrum
Alder, European
Alnus glutinosa
Catalpa, Northern/Western, HEARTLAND®
Catalpa speciosa
Hackberry, Common Hackberry, PRAIRIE SENTINEL®
Celtis occidentalis
Katsura, Katsura Tree
Cercidiphyllum japonicum