Scientific: Ulmus parvifolia
Common: Chinese elm (lacebark elm)
Family: Ulmaceae
Origin: China

Pronounciation: UL-mus par-vi-FO-le-a

Hardiness zones
Sunset
8,9, 12-24
USDA 6-11

Landscape Use: Residential shade tree, street tree, accent. Also, makes an excellent bonsai.

Form & Character: Upright, inverted vase with an open canopy and umbrella top spread, small branches are weeping especially if propagated from stem cutting. With training. It is duly noted that Chinese elm can have the quintessential inverted vase form that's ideal for trees in urban settings.

Growth Habit: Woody, semi-evergreen perennial tree, Moderate to fast to 40 to 60 feet with equal spread.

Foliage/texture: Small 1 to 3 inches long, elliptic to ovate leaves with serrate margins and an inequilaterally or cuneate base, alternate arrangement, 'bark' is shed in a 'puzzle-piece' fashion; medium fine texture.

Flowers & fruits: Flowers greenish yellow in late summer of year followed by single-winged samara that are greenish pink in late fall to winter.

Seasonal color: Brilliant, light green foliage in spring, sometimes yellowish-red fall to winter color from foliage during cooler falls and early cold winters. Stays evergreen though in coastal southern California.

Temperature: Hardy, but in Phoenix the foliage will become marginally necrotic in late summer and early fall due to summer heat stress.

Light: Full sun

Soil: Tolerant

Watering: To maintain vigor, irrigate regularly during spring, summer and early fall. Supplemental water also improves appearance.

Pruning: Needs to be vigorously trained and staked when young, especially if asexually propagated from cutting.

Propagation: Cutting or seed. Most locally available trees are cutting grown.

Disease and pests: Sometimes susceptible to Texas root rot, but resistance to Dutch elm disease. In addition, cultivars 'Drake', 'Truegreen' and 'Evergreen' are susceptible to canker disease (Fusarium lateritium and Diplodia sp).

Additional comments: One of the best mesic shade trees for the lower Arizona desert landscapes, Chinese evergreen elm has the quintessential urban form. There are numerous cultivars such as:

In the nursery and landscape trades Chinese elm is sometimes confused with with U. pumila (Siberian elm). Siberian elm flowers in spring, has a relatively stiff and rigid growth habit, weaker and more brittle wood, produces more litter, and has less glossy leaves than Chinese elm. Most experts outside of the upper Midwest and Plains states (where Chinese elm does not grow) consider Siberian elm to be a trash tree when compared to Chinese elm.

Hidden secret: Chinese elm trees can naturalize (reseed) in heavily and not so heavily irrigated landscapes in Phoenix.