Science · Specimen Trees
Tristania (Water Gum)
An Australian evergreen often retained under the older horticultural name Tristania. Water gum has attractive bark and small yellow flowers; its streamside origins do not mean it should be planted in permanently stagnant soil.
Tristaniopsis laurina · Evergreen flowering tree
Profile
- Taxonomy
- Tristaniopsis laurina is the current name; Tristania laurina is a synonym.
- Habitat
- Eastern Australian stream margins and moist forests.
- Planting
- Set the root flare at grade and protect the expanding root zone from compaction.
- Assessment
- Confirm identity, local climate suitability and drainage before prescribing care.
Water & soil targets
- Moisture (VWC)
- Site-calibrated; varies by soil and rootstock
- Salinity tolerance
- Avoid saline irrigation unless local evidence supports the specific site.
- Drought tolerance
- Moderate once established; better with summer moisture.
Optimal root measurement depth
8–18 in
Most absorbing tree roots live in the upper 12–18 inches, out toward the drip line. Typical guidance; confirm with a soil probe on site.
Water consistently while establishing and deeply during extended dry periods; maintain drainage and allow air back into the root zone between irrigations.
Problems to watch
- Scale insects
- Sooty mold associated with honeydew
- Root disease in poorly aerated soil
Stress signs
- Leaf scorch
- Thinning canopy
- Branch-tip dieback
Where you'll find it
- Street and courtyard trees
- Evergreen ornamental shade
More specimen trees
Coast Live OakSouthern Live OakDate Palm (Medjool)Canary Island Date PalmCoast RedwoodJapanese Maple
All Science profilesGeneral agronomic guidance and typical ranges; actual targets vary by site, soil, climate and season.