Sichuan pepper (huajiao) Zanthoxylum bungeanum
Sichuan pepper (huajiao) (Zanthoxylum bungeanum) is a deciduous perennial shrub in the Rutaceae family, native to China (Gansu, Shaanxi, Sichuan to Shandong) and Taiwan. It grows 3–7 m (10–23 ft) tall and 2–4 m (6.6–13 ft) wide, wants full sun and low water, and is hardy to about -20 °C (-4 °F). Space plants about 3 m (10 ft) apart.
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Sichuan pepper (huajiao) at a glance
| Type | Perennial shrub, deciduous |
|---|---|
| Family | Rutaceae |
| Mature height | 3–7 m (10–23 ft) |
| Mature spread | 2–4 m (6.6–13 ft) |
| Spacing | 3 m (10 ft) centre to centre |
| Sun | Full sun, at least 6 h of direct sun a day |
| Water | Low; drought tolerance moderate, waterlogging tolerance none |
| Soil pH | 6–8 |
| Cold hardiness | About -20 °C (-4 °F) once established (roughly USDA zone 6) |
| Heat stress | Likely above about 36 °C (97 °F) |
| Flowering | from about April for 2–3 weeks (northern hemisphere; later in cold climates, earlier in warm ones) |
| Wind tolerance | Low |
| Pollinator value | Moderate |
| Edible | Yes: dried fruit husks (numbing spice), young leaves |
| Native to | China (Gansu, Shaanxi, Sichuan to Shandong) and Taiwan |
| Common in gardens of | 🇨🇳 China, 🇰🇷 South Korea, 🇺🇸 United States, 🇬🇧 United Kingdom, 🇩🇪 Germany |
Is Sichuan pepper (huajiao) toxic?
- People: not known to be toxic
- Cats: not known to be toxic
- Dogs: not known to be toxic
Not poisonous; hydroxy-α-sanshool causes the tingling, numbing feel (málà). Thorny: plant away from paths.
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 Sichuan pepper (huajiao)
No well-documented helpful pairing. Group it with plants that like full sun and low water.
Keep apart or take care
- caution With Sweet orange: Asian citrus psyllid spreads huanglongbing (citrus greening) between citrus and relatives such as orange jasmine (Murraya). Keep new citrus away from infected or neglected hosts. Evidence B
Questions about Sichuan pepper (huajiao)
- How far apart should I plant Sichuan pepper (huajiao)?
- About 3 m (10 ft) apart, centre to centre. A mature plant spreads 2–4 m (6.6–13 ft).
- Does Sichuan pepper (huajiao) need full sun?
- Full sun: at least 6 hours of direct sun a day.
- How much water does Sichuan pepper (huajiao) need?
- Low water. Drought tolerance is moderate and waterlogging tolerance none.
- How cold-hardy is Sichuan pepper (huajiao)?
- It tolerates about -20 °C (-4 °F) once established, roughly USDA zone 6.
- When does Sichuan pepper (huajiao) flower?
- From about April for 2–3 weeks (northern hemisphere; later in cold climates, earlier in warm ones).
- Is Sichuan pepper (huajiao) poisonous to cats and dogs?
- For cats it is not known to be toxic; for dogs not known to be toxic; for people not known to be toxic. Not poisonous; hydroxy-α-sanshool causes the tingling, numbing feel (málà). Thorny: plant away from paths.
- What grows well with Sichuan pepper (huajiao)?
- There is no well-documented companion pairing for Sichuan pepper (huajiao). Group it with plants that like the same sun (full sun) and water (low).
Sources and evidence
Evidence grade B (B: extension service or peer-reviewed).
- Plants of the World Online (taxonomy, native range), Royal Botanic Gardens, Kew
- Flora of China (eFloras), Missouri Botanical Garden & Harvard University Herbaria
- Plants For A Future database, PFAF
Notes and assumptions
- A prickly, aromatic shrub with pinnate leaves; red, pebbly husks split to drop black seeds. Grown on terraces in Sichuan, Gansu and Shaanxi. The USA banned imports from 1968 to 2005 because the plant can carry citrus canker. Usually self-fertile (apomictic).
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
- Lemon tree (dwarf) Citrus limon
- Curry tree Murraya koenigii
- Kaffir lime Citrus hystrix
- Common rue Ruta graveolens
- Sweet orange Citrus x sinensis
- Mandarin orange Citrus reticulata
- Persian lime Citrus x latifolia
- Key lime Citrus x aurantiifolia