Ulmus parvifolia 'Drake'
(Chinese Elm)
SIZE: Medium (Height: 40-60'; Spread: 50-70').
GROWTH RATE: Fast.
FOLIAGE: Dark green, serrated, oval leaves 1-2" long. Fall foliage is yellow or reddish purple. In cold winters, tree can lose leaves December-February. Tree is usually never fully bare in San Francisco.
FLOWER/FRUIT/BARK: Insignificant flowers. Brown, winged fruit, 1/2" long, forms in fall and drops. Mottled, light gray-brown trunk.
MONTHLY WATERING NEEDS: In general, 15-20 gallons per week for the first 2 years; 15-20 gallons twice a month for the 3rd year; as needed after 3 years (varies by soil, sun, and wind conditions).
TREE CARE: High. Early pruning to establish and maintain a central leader and to develop good branch structure.
TOLERANCES: Drought (once established), poor drainage, any soil.
SPECIAL CONSIDERATIONS: Prefers sun. Does not tolerate strong winds. Subject to anthracnose.
NOTABLE TRAITS: Native to China, Korea, and Japan. Willow-like form with lacy foliage and attractive bark. Resists pests and diseases, including Dutch elm disease. Quickly creates shady canopies. 'Drake' resists anthracnose better than other Chinese Elms.
ALTERNATE FORMS: 'Sempervirens' may be evergreen most winters, but loses its leaves in unusual cold snaps.