Ulmus parvifolia
11 Chinese Elm bonsai in stock, from $51.95 Shipped direct from our nursery partners, with a 48-hour live-arrival guarantee. See the trees
Zones 5 to 10, indoor or out. Native to China (north-central to southern), Vietnam, South Korea, Japan and Taiwan.
Ulmaceae (the elm family) · Deciduous to semi-evergreen broadleaf tree; kept as an indoor or outdoor bonsai
Compare your tree against these to confirm the species and spot problems early.
| USDA zones | 5 to 10 in the ground [1] [3]; in a pot, about zone 6 with wind shelter and a mulched pot [12] |
|---|---|
| Indoor / outdoor | Indoor-capable in very bright light [11] [12]; grows stronger outdoors [11] |
| Light | Full sun or partial shade outdoors [11] [13]; the brightest south- or west-facing window indoors [11] |
| Water | Moist, never soggy and never bone dry: water when the top layer is slightly dry [11]; Bonsai4Me keeps indoor compost evenly moist [12] |
| Soil | Any well-draining bonsai soil; no special needs [11] |
| Repot | Every two years while young, less often when older, in spring [11]; Bonsai4Me root prunes yearly in spring and repots every two to three years even when refined [12] |
| Frost | Fully frost hardy once hardened off outdoors in autumn [12]; potted trees with wind shelter and a mulched pot take about -10°F (-23°C) [12]; hardiness varies with the tree's origin [11] |
| Mature height | 40 to 50 ft (12 to 15 m) in the ground [1] [4] [5]; up to 70 ft [6] [7] or 80 ft (24 m) [3] [11] |
| Growth rate | Sources differ: relatively fast as a bonsai [11]; moderate or medium in the landscape [1] [3] [4] |
| Season of interest | Mottled, flaking bark all year [5]; fall color from green to yellow to red [5] |
| Leaf reduction | Small leaves and fine ramification [11]; not rated by the sources we checked |
| Main risks | Main risks, not ranked by any source: waterlogged soil and root rot [12]; low light indoors [11]; moving an indoor tree straight into winter cold [12] |
Chinese elm is native to China (north-central to southern), Vietnam, South Korea, Japan and Taiwan [10]. It builds fine branching with small leaves [11], and mature trees have flaking bark [11]. Bonsai Empire calls it a popular beginner's tree because it is strong, takes pruning well and can live indoors or out [11].
Bonsai4Me says they are often sold as indoor bonsai, but the species is a temperate tree and fully frost hardy [12]. Indoors it copes with plenty of light, yet it grows stronger outside [11] [12]. Grown indoors or in a very mild climate it stays evergreen; outdoors it is deciduous [12].
Foliage. Alternate, simple, glossy dark green leaves [1], 3/4 to 2 1/2 in long [9], with a serrated edge [6] and an unequal base [9]. Morton gives 3/4 to 2 in [4] and Minnesota 2 to 3 in [7].
Bark & trunk. The bark flakes off in mottled, puzzle-piece patches of gray, green, orange and brown [3] [6], distinctive even on young trees [6].
Growth habit / form. A wide, graceful crown of fine branches [6], rounded or vase-shaped [1] [8].
Flowers / fruit / seeds. Small, inconspicuous flowers open in late summer rather than spring [4] [5], or late summer into early fall [6]. UF/IFAS lists flowering as late spring [3]. The fruit is a flat, papery winged samara about 1/2 in (1 cm) long with the seed in the center [1] [5], appearing in fall and sometimes lasting into early winter [1].
Look-alikes & how to tell them apart: Siberian elm (Ulmus pumila) is the main one, and it is sometimes sold as Chinese elm [5]; NC State even lists "Chinese Elm" as one of its common names [2]. Check the bark and the flowering season. Siberian elm bark is gray-brown and furrowed [2] [11], not flaking in colored patches [3]. Siberian elm flowers in spring, March to May, before its leaves open [2]; Chinese elm usually flowers in late summer [4] [5]. Siberian elm leaves are larger [11], 1 to 3 in long, with doubly toothed edges [2]. Japanese zelkova is the other common mix-up: its bark stays smooth, and its leaves are often narrower and more pointed [11]. Bonsai Empire adds that trees sold in Europe as zelkova bonsai are often Chinese elm [11].
NC State and UF/IFAS put Chinese elm in USDA zones 5b to 10a [1] [3]; Morton gives 5 to 9 [4], Minnesota 4 to 9 [7]. These are figures for trees in the ground.
A potted tree is more exposed: Bonsai4Me puts a bonsai at about zone 6, coping with -10°F (-23°C) when sheltered from cold wind with the pot mulched [12], while freezing wind can kill fine twigs [12]. The tree must spend autumn outdoors to harden off, and an indoor-grown elm should never go straight outside in winter [12]. Stock from northern China is hardier than stock from the south [11]. Winter an indoor tree in a cool room that does not freeze [11], away from central heating [13].
Outdoors it does well in full sun or partial shade [11] [13], ideally with strong morning light [11]. Indoors, give it the brightest spot available, such as a south- or west-facing window [11]; Herons says it needs full sun indoors [13]. Too little light gives weak, stretched growth and larger leaves [11], and growth slows indoors and in winter [11].
Even moisture, no extremes. The tree cannot take long dry spells or constant wetness [11]. Water by observation, not by schedule: when the top layer is dry, water until the whole root mass is wet [11]. Bonsai4Me keeps indoor compost evenly moist, but warns that routine daily watering makes it sodden and leads to root rot and death [12]. Herons keeps the soil just moist, never waterlogged [13]. In strong sun, heat or spring growth, trees can need water far more often [12]. Planted in the ground the species is rated drought tolerant [1] [3], but as a bonsai it cannot take long dry spells [11].
There are no special soil needs; use a well-draining mix [11]. In the ground it adapts to many soil textures and pH levels [1].
Bonsai Empire repots young trees every two years and older ones less often, in spring [11]. Bonsai4Me gives two figures on one page: yearly root pruning in spring, and every two to three years even for refined trees; a potbound elm slowly loses branches [12]. Elm roots grow crooked and tangled, so prune them carefully to build good surface roots [11]. Trees that winter indoors can be repotted in autumn after leaf drop, before they come in [12].
Feed generously in the growing season, for example solid organic plus balanced liquid fertilizer [11]. Herons feeds every two weeks [13]. Bonsai4Me feeds outdoor trees weekly with high nitrogen for the first month after the buds open, then every two weeks with a balanced feed until late summer; indoor trees weekly in spring and summer and monthly in winter [12]. Do not feed a dormant tree [11] or one out of leaf [12].
The trunk thickens fast and the tree needs frequent trimming to build fine branching [11]. Let a shoot grow 3 or 4 nodes, then cut it back to 1 or 2 leaves [11] [12]. It buds well from old wood after hard pruning [11], but steady light trimming works better than occasional heavy cuts, and hard pruning should wait while growth is weak or light is low [11].
Timing for large cuts differs: late autumn [11] [13], late summer and autumn to limit heavy callus [12], or early spring for structural pruning [11].
It takes wire and guy wires well [11]. Bonsai4Me wires in midsummer (indoor trees in midwinter), warns that the bark marks easily, and defoliates healthy trees in midsummer or winter to make wiring easier [12]. Elms suit every style, the broom form above all [12].
Ease: Easy from cuttings [11]. Best methods: cuttings [11]; seed, cuttings or air layering [12].
Bonsai Empire recommends cuttings over seed [11]. Bonsai4Me takes greenwood cuttings in summer and hardwood cuttings in winter, sows seed in autumn or spring, and air layers once spring growth has hardened [12]. For landscape trees, NC State names seed as the best method [1].
Spider mites and scale are common when the air is dry; spraying the tree with water helps keep them away [11]. Bonsai4Me also lists aphids, leafhoppers and gall mites [12]. The sources differ on sprays: Bonsai Empire warns that thinned lime sulfur or systemic pesticides can make a Chinese elm drop all its leaves [11], while Bonsai4Me uses a dilute lime sulfur winter wash on bare elm branches against gall mites [12]. Landscape trees resist elm leaf beetle [4] and Japanese beetle [3].
Dutch elm disease. Chinese elm is usually resistant [3] [7]; Clemson rates its resistance very high [8]. Bonsai4Me adds that elm bonsai are not affected, because the beetle that spreads it needs the wood of a full-size tree [12].
Landscape trees occasionally get wilts, rots, cankers and leaf spots [1], elm yellows [4] or twig blight [3]. In a pot, the main danger is root rot from sodden soil [12].
No source we checked ranks these. They are the main risks the sources describe, in no particular order:
Trees from our own bench, filmed while we worked on them.
Play video (2:01)I cut this long, leggy Chinese elm back hard, cleaned it up, fine-pruned, wired and thinned it in one session. The cutting looks brutal, but Chinese elm back-buds on old and new wood. In my experience overwatering is the biggest risk, so I let the topsoil start to dry, then water deeply. Elm bark marks, so the wire comes off before it bites in.
