River Redgum Eucalyptus camaldulensis
River Redgum is an introduced perennial tree, found in Hawaii, the lower 48 states, and Puerto Rico. It grows to 120 ft and blooms Mar in full sun – part shade, with brown fruit.
More about this plant
Eucalyptus camaldulensis, commonly known as river red gum, is a flowering plant in the family Myrtaceae, and is endemic to Australia. It is a tree with smooth white or cream-coloured bark, lance-shaped or curved adult leaves, flower buds in groups of seven or nine, white flowers and hemispherical fruit with the valves extending beyond the rim. A familiar and iconic tree, it is seen along many watercourses across inland Australia, providing shade in the extreme temperatures of central Australia and elsewhere. Wikipedia →
River Redgum is flagged invasive in the U.S. These natives fill a similar niche — same growth habit, bloom season, height, and region — so you keep the look and feed local wildlife instead of spreading a problem.
Growing & care
USDA PLANTS · TRY- Sun
- Full sun – part shade
- Soil & moisture
- High moisture
- Soil pH
- 5–8.5
- Fertility need
- Low
- Adapts to
- Coarse (sandy), Medium (loam), Fine (clay)
- Hardiness
- USDA zone 9+
- Height
- 120 ft
- Mature width
- ≈ 21 ft wide wild/forest-grown — open-grown specimens spread wider
- Spacing
- 6–16 ft apart from USDA planting density
- Spread
- None — clumping
- Growth rate
- Rapid
- Growth form
- Single stem
- Lifespan
- Perennial · long-lived
- Foliage
- Evergreen broadleaf · coarse texture
- Active growth
- Spring through autumn
- Fruit
- Brown persists into winter
- Propagate by
- Seed, Bare root, Container
- Seed starting
- No stratification needed
- Seeds ripen
- Summer – Winter seed-collection / harvest window
- In the trade
- Routinely available
- Deer browsing
- Low often deer-resistant
- Resprouts if cut
- Yes regrows after top-kill
Sow timing keys off your local last- and first-frost dates.
Wildlife & pollinators
How pollinator value is scored →❧ Caterpillar hosts Documented caterpillar host
Recorded feeding on Eucalyptus in North America, including:
+ 3 more species → ↑ show fewer
✦ Bees 3 bee visitors
3 native & managed bee species are documented visiting River Redgum :
Wildlife & visitors 5 birds · 3 mammals · 1 nectaring
Open records of who else uses River Redgum — a generalist food-web signal, kept separate from the keystone Ecological Value.
Recorded eaten by 5 birds and 3 mammals species (fruit, seed, browse):
+ 2 more species → ↑ show fewer
1 adult butterfly & moth species is recorded nectaring at its flowers:
Related plants
More Eucalyptus →
How we know this (3) Methods & honest limits
We read each species’ measured specific leaf area (leaf area per unit dry weight) from the Global Spectrum dataset and band it: thin & fast (high SLA), medium, or thick & tough (low SLA). The global median is about 10 mm²/mg.
Honest limits: A species-mean from pooled measurements — individual plants vary with light and site. A broad strategy signal, not a precise per-plant figure.
A recorded categorical fact: each species is tagged C3 (standard), C4 (heat/water-efficient) or CAM (succulent, night-time CO₂ uptake) — or a facultative combination. We only show a trait card for the noteworthy C4/CAM cases; C3 is the unremarkable majority, kept in the data but not surfaced as a card.
We take the plant’s U.S. county range and look up each county’s long-term climate, then summarise: native rainfall = the median annual rainfall across its counties; heat tolerance = the warm end (90th percentile) of average temperature across its range (mirroring how our cold-hardiness floor uses an extreme). Counties + medians blunt the roadside/observer bias that makes point-level climate unreliable. Needs at least five placeable counties.
Honest limits: A realized, sampling-biased niche (where it has been recorded, not its physiological optimum), and county climate is coarse — large Western counties span deserts and mountains. Derived guide, never a measured fact.
Sources for this entry (35) Open & cited
Cite this page Open data, please attribute
PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).
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