Wall cotoneaster Cotoneaster horizontalis
Wall cotoneaster (Cotoneaster horizontalis) is a deciduous perennial shrub in the Rosaceae family, native to Western China. It grows 60 cm–1 m (24 in–3.3 ft) tall and 1.5–2.5 m (4.9–8.2 ft) wide, wants full sun and low water, and is hardy to about -29 °C (-20 °F). Space plants about 1.5 m (4.9 ft) apart.
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Wall cotoneaster at a glance
| Type | Perennial shrub, deciduous |
|---|---|
| Family | Rosaceae |
| Mature height | 60 cm–1 m (24 in–3.3 ft) |
| Mature spread | 1.5–2.5 m (4.9–8.2 ft) |
| Spacing | 1.5 m (4.9 ft) centre to centre |
| Sun | Full sun, at least 5 h of direct sun a day |
| Water | Low; drought tolerance high, waterlogging tolerance none |
| Soil pH | 6–8 |
| Cold hardiness | About -29 °C (-20 °F) once established (roughly USDA zone 4) |
| Heat stress | Likely above about 33 °C (91 °F) |
| Flowering | from about May for 2–4 weeks (northern hemisphere; later in cold climates, earlier in warm ones) |
| Wind tolerance | Moderate |
| Pollinator value | High |
| Edible | Not grown as food |
| Native to | Western China |
| Common in gardens of | 🇬🇧 United Kingdom, 🇩🇪 Germany, 🇨🇳 China |
| Invasive in | UK (Wildlife and Countryside Act Schedule 9), Australia (environmental weed in southern states), New Zealand (pest plant): check local rules before planting |
Is Wall cotoneaster toxic?
- People: mildly toxic
- Cats: mildly toxic
- Dogs: mildly toxic
- Parts: berries, seeds
Berries contain cyanogenic glycosides and can cause mild stomach upset in children and pets.
If a child or pet may have eaten part of a plant, call a poison centre or vet straight away.
Companion planting: what to grow with Wall cotoneaster
Good neighbours
- good With Garlic chives: Gardeners plant garlic chives among roses to deter aphids and black spot; the evidence is weak and mostly anecdotal. Evidence D
Keep apart or take care
- caution With Firethorn (pyracantha): Pyracantha and Cotoneaster are both hosts of fireblight (Erwinia amylovora), so an infected plant can pass the bacterium to the other via insects and rain. Evidence B
- caution With Japanese flowering quince: Chaenomeles and Cotoneaster are both pome-fruit relatives that can host fireblight, so the disease can move between them in warm, wet spring weather. Evidence B
Shared pests and diseases
- Fire blight: Fire blight bacteria are carried by bees and rain between apples, pears, quince, hawthorn, cotoneaster and firethorn. Evidence B
Questions about Wall cotoneaster
- How far apart should I plant Wall cotoneaster?
- About 1.5 m (4.9 ft) apart, centre to centre. A mature plant spreads 1.5–2.5 m (4.9–8.2 ft).
- Does Wall cotoneaster need full sun?
- Full sun: at least 5 hours of direct sun a day.
- How much water does Wall cotoneaster need?
- Low water. Drought tolerance is high and waterlogging tolerance none.
- How cold-hardy is Wall cotoneaster?
- It tolerates about -29 °C (-20 °F) once established, roughly USDA zone 4.
- When does Wall cotoneaster flower?
- From about May for 2–4 weeks (northern hemisphere; later in cold climates, earlier in warm ones).
- Is Wall cotoneaster poisonous to cats and dogs?
- For cats it is mildly toxic; for dogs mildly toxic; for people mildly toxic. Berries contain cyanogenic glycosides and can cause mild stomach upset in children and pets.
- What grows well with Wall cotoneaster?
- Gardeners plant garlic chives among roses to deter aphids and black spot; the evidence is weak and mostly anecdotal.
Sources and evidence
Evidence grade C (C: plausible, mixed evidence).
- RHS Plant Finder, Royal Horticultural Society
- Missouri Botanical Garden Plant Finder, Missouri Botanical Garden
- CABI Invasive Species Compendium, CABI
Notes and assumptions
- Typical garden-form values; cultivars and local conditions differ.
- Semi-evergreen in mild winters; herringbone branches are often trained against a wall; bird-sown seedlings are the main spread route.
Reference values for planning, not horticultural, veterinary or medical advice. Varieties, soils and local climates differ: check with a local nursery or extension service.
Related plants
- Strawberry Fragaria x ananassa
- Dwarf apple tree Malus domestica
- Common ninebark Physocarpus opulifolius
- Serviceberry Amelanchier canadensis
- Raspberry Rubus idaeus
- Blackberry Rubus fruticosus agg.
- Garden rose Rosa x hybrida
- Japanese flowering cherry Prunus serrulata