Zelkova serrata
Keaki, Japanese zelkova, Sawleaf zelkova
Also known as Zelkova acuminata, Zelkova keaki
- Height × spread
- 20m × 10m
- Position
- Full sun
- Hardiness
- Very cold to -20C (RHS H6)
- Flowers
- Autumn
Availability
Please ask in store about availability
Many plants are seasonal. Call 01234 567890 to check current stock.
About this plant
A good looking tree with a spreading growth habit and an attractive, slightly formal air. It has a handsome grey bark that will begin to flake when the tree is maturing. The leaves are crisply incised on their edges, long and tapering, looking something like those of some birch trees. They turn red or bronze in autumn, the effect on a mature tree being spectacular. The flowers and fruits are of little ornamental value and may not notice, being coloured green. There are a number of more compact selections. The tree originates in the Far East including Japan, China and Taiwan.
- Foliage colour
- Green
- Autumn foliage
- Red-bronze
- Variegated
- No
- Scent
- No
- Shape
- Dome
- Height
- 20m
- Spread
- 10m
- Height in 10 years
- 5m
- Spread in 10 years
- 3m
- Season of interest
- Autumn, Winter
- Flowers in
- Autumn
- Evergreen
- Deciduous
- Sun or shade
- Likes full sun, likes part shade, tolerates light shade
- Soil type
- Chalk, Loam (normal)
- Soil pH
- All types
- Drainage
- Moisture retentive soil, Well drained soil
- Hardiness
- Very cold to -20C (RHS H6)
- Borders & containers
- Borders
- Use for
- Architectural
- Hazards
- No
Spring
Spring - late · Outdoors
Feed young plants with slow release fertiliser
Spread a slow release fertiliser around the base of the plant to the edge of the foliage spread, so that it can feed the roots. It is helpful for this to be applied for several years.
This is a simple way to provide a nutrient boost until the plant becomes well established.
Spring-Autumn · Outdoors
Water to keep the soil moist
For best results, this plant needs soil that is always moist. Water deeply and regularly as soon as soil appears dry. Even for established plants in the ground, a dry week can cause problems with some soils. Check plants in pots more often, especially in hot weather. Or install an automatic irrigation system which will do the hard work for you, even when you are away on holiday.
Without regular watering some plants never fully regain their beauty.
Spring-Autumn · Planting
Prune to maintain young trees
While it is still possible to safely reach up and into the tree, remove dead or damaged foliage, and crossing or misplaced branches in early spring while the plant is still dormant.
Planting & general
Outdoor planting · Planting
Add root growth stimulant to the planting hole
Mycorrhizal fungi helps roots establish quickly, so they absorb water and nutrients more efficiently. It comes as a powder, granule or gel. Add to the planting hole or container, and to the plant's rootball before planting in the hole. For "bareroot" plants use a gel.
Planting
Protect & support young trees
Attach a newly planted tree or tall shrub over 1m to a tree stake to give support and prevent windrock. Use a tree guard to stop tree bark being eaten by animals, especially in areas with deer - removing bark injures a tree and in worst case can kill it.