Zelkova serrata
Japanese Zelkova
Ulmaceae
ExpandHabitat
- native to Japan
- zone 5
Habit and Form
- a medium-sized deciduous tree
- 50' to 70' tall
- rounded and broad crown when mature
- young tree more or less vase-shaped
- main branching starts low creating a short trunk
Summer Foliage
- alternately arranged deciduous leaves
- simple leaves
- margins toothed
- elliptical shape
- acuminate leaf tip
- 1.25" to 3" long
- 0.75" to 1.5" wide
- dark green color
Autumn Foliage
- fall color is variable
- a mix or yellow, russet, bronze, dark red and purple
- can be quite showy on good specimens
Flowers
- not ornamental
- blooms in April
Fruit
- a small drupe
- not ornamentally important
Bark
- attractive
- exfoliates in patches exposing orangish inner bark
- young bark is smooth with prominent lenticels
- base bark color is steel gray
Culture
- full sun
- prefers well-drained, moist, deep, fertile soil
- relatively tolerant of drought and pollution once established
- tolerant of a range of soils pHs
- easy to transplant and establish
- needs room to develop wide crown
Landscape Use
- lawn tree
- urban areas
- possibly a street tree
- parks and campuses
- for attractive bark characteristics
- for vase-shape
Liabilities
- twig dieback due to lack of cold hardiness
- Japanese beetle feeding on foliage
- shows fairly good resistance to Dutch Elm Disease and bacterial canker, but not immune
ID Features
- short main trunk and low branching
- vase-shaped habit
- slender twigs with small dark, conical buds in a zigzag pattern
- smooth bark with lenticels or exfoliating in patches to reveal orange inner bark
Propagation
- by cuttings or bud-graftings
- by seed
Cultivars/Varieties
'Goshiki' - This variegated form features leaves splashed or dusted with creamy white. The plant is sometimes offered by specialty nurseries and grows fairly well. 'Variegata' features a white rim around the leaves, but it's a weak grower.
'Green Vase'- This popular form is a fast grower to 70' tall with a width of 35' to 40'. It maintains a vase-shape with upright arching branches. It is taller and less broad than 'Village Green' at maturity, plus it grows more quickly. The fall color is bronze-red. It is widely considered the best selection.
'Halka' - This is one of the more popular forms, but it lacks the merit of 'Village Green' or 'Green Vase'. It reaches 50' tall with a spread of 30', but the habit is more open and loose. It lacks the dense uniformity of the other two cultivars, plus the yellow fall color does not rival their display.
'Spring Grove' - A potential rival for 'Village Green', this selection is yet to see mass production. It exhibits a distinct vase shape with tight branching. It is also ornamentally superior for its dark green leaves, red fall color and attractive peeling bark. The plant has the potential to grow 80' tall with a spread of 60'.
'Village Green' -A common plant in commerce, this form develops a straight, clean trunk and reaches 50' to 60' tall. The canopy is quite wide and dense with dark green leaves, while the fall color is rusty red. It expresses good disease and insect resistance with excellent cold hardiness. It grows quickly and vigorously as a young plant.