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Japanese Zelkova Tree Care and Propagation: A Comprehensive Guide

by Peter

Japanese Zelkova: A Versatile Tree for Landscapes

Care and Maintenance

Japanese zelkova trees are relatively low-maintenance, but they do require some attention to thrive.

  • Pruning: Pruning is essential to develop the tree’s structure and prevent breakage. Remove branches that grow inward towards the leader, creating deep V-shaped crotches.
  • Light: Japanese zelkovas prefer full sun to partial shade. The sunnier the location, the better the fall colors will be.
  • Soil: These trees are tolerant of various soil types, including clay, loam, and sand, as long as the soil is well-draining. Soil pH is not a primary concern.
  • Water: Japanese zelkovas are drought-tolerant and do not require frequent watering.
  • Fertilizer: Supplemental fertilizer is generally not necessary. However, if the tree is not performing well, soil amendments can provide a boost.

Types of Japanese Zelkova

There are several popular cultivars of Japanese zelkova available, each with unique characteristics and growth habits:

  • ‘Halka’: Fast-growing and large, suitable for commercial settings.
  • ‘Village Green’: Wide-spreading, ideal for open spaces.
  • ‘Wireless’: Very wide spread, lower growth, good for shade trees.
  • ‘Green Vase’: Narrower vase-shape, suitable for driveways and streets.
  • ‘Musashino’: Narrowest crown among the cultivars.

Propagation

Japanese zelkovas can be propagated by seeds or plant cuttings:

  • Seeds: Growing from seed requires patience and cold stratification for 6-8 weeks.
  • Cuttings: Take new branch cuttings in spring or early summer, dip them in rooting hormone, and place them in moist potting soil.

Growing from Seed

  • Harvest seeds in fall when pods dry.
  • Refrigerate seeds for 6-8 weeks to break dormancy.
  • Sow seeds in garden soil about 1/4 inch deep and keep moist.
  • Seeds should germinate within a few months.

Common Pests and Diseases

  • Aphids: These insects attack the tree in spring, causing leaf damage.
  • Scale insects: They suck the juices from leaves and twigs, leaving behind “honeydew.”
  • Phytophthora stem and collar rot: This soil-borne fungus causes cankers on twigs.

Common Issues

The primary concern with Japanese zelkova trees is their tendency to break due to multiple leaders and fragile wood. Choose a tree with a single trunk or select cultivars with improved strength.

FAQs

  • Is zelkova a good tree? Yes, Japanese zelkova is a good choice for shade trees, specimen trees, and street trees due to its disease resistance and elm-like appearance.
  • Is a zelkova tree messy? While zelkova trees are deciduous, they are not considered particularly messy. Different types shed varying amounts of leaves and bark.
  • Are Japanese zelkova trees invasive? No, Japanese zelkova trees are not invasive.

Additional Tips for Care

  • Plant young zelkova trees in the spring to avoid frost damage.
  • The tree will have a medium growth rate of 1 to 2 feet annually.
  • Keep the tree free from damage, especially in areas where icing is possible.
  • Prune the tree in late fall through late winter.
  • Consider soil amendments if the tree is not performing well.
  • Monitor the tree for pests and diseases and treat them promptly.

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