Scientific: Corymbia citriodora (formerly Eucalyptus citriodora)
Common: lemon-scented gum, blue spotted gum, lemon eucalyptus
Family: Myrtaceae
Origin: Coastal zones of Queensland in northeastern Australia.

Pronounciation: Cor-RIM-bee-a ci-tree-a-DOOR-a

Hardiness zones
Sunset 12-24
USDA 9-11

Landscape Use: This is a striking, vertical accent tree for groupings in large and expansive landscape spaces, trunk accent, commercial oil production.

Form & Character: Large evergreen tree with a refined and thin character, often sparse as if on a diet.

Growth Habit: This perennial evergreen tree has an extremely upright and narrow habit becoming more rounded at a mature age. It can grow as tall as 60 to 80 feet in Phoenix, though up to 150 feet in southern California and in northeast coastal Australia.

Foliage/texture: Greyish-green lanceolate leaves that taper to an acuminate tip, generally 5 inches long, only slighly falcate, distinct single central vein transects leaf length; medium fine texture.

Flowers & fruits: Small white summer flowers, inconspicuous, fruit pediculate, brown capsules when mature, inconspicuous.

Seasonal color: None, but this tree's startling trunk characteristics should always be on display.

Temperature: Cardinal temperature range is 25o to 110oF.

Light: Full sun

Soil: Tolerant

Watering: Moderately drought tolerant in Phoenix (meaning some supplemental irrigation is needed).

Pruning: Elevate the canopy base (raise the crown) as necessary, train extensively when young so as to avoid having to later make large pruning cuts leaving gaping wound scars on this tree's otherwise smooth creamy white trunk.

Propagation: Seed

Disease and pests: None

Additional comments: Lemon-scented gum is marginally-adapted to the desert summer heat and thus is not the best eucalyt for Phoenix. Afterall, it is a coastal tree. Otherwise, this is a majestic tree that really thrives in coastal and inland valleys of southern and central California. Trunk vandalism is a problem, especially in high traffic commercial landscapes. The cultivars 'Dwarf', 'Pink Dwarf', and 'Baby Citro'TM are dwarf selections from Australian nurseries that grow less than 25 feet tall. So in summary, in Phoenix lemon-scented gum is a poor choice when compared with the more heat tolerant eucalypts such as Corymbia papuana (ghost gum).

The essential oils of the lemon-scented gum foliage mainly consist of citronellal.