Large riparian European tree. Bark is the natural source of salicin — the precursor compound that led to the synthesis of aspirin.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 2–8 | −45.6 °C to −6.7 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H7 | down to −20 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 2–8 | −40 °C to −1 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 1–4 | −15 °C to 5 °C | Plant tolerates down to this zone |
About Willow — White
Willows root with exceptional ease — cuttings pushed into damp ground frequently take without any further attention — which is the basis of living willow structures and of their use in stabilising riverbanks. Willow bark contains salicin, the compound from which salicylic acid and ultimately aspirin were developed, and the traditional use of the bark for pain long predates that chemistry. The roots are vigorous and water-seeking, which is why willows are a poor choice near drains and foundations. Most species are dioecious, with separate male and female trees.
Growing notes
- Salicin and aspirin share the same broad cautions — sensitive individuals, gastric ulcers, anticoagulant interactions
- Roots are aggressive and water-seeking — never plant near drains, septic systems or underground pipes
- Host plant for an exceptional number of insect species
- Always consult a qualified medical or herbal practitioner before using any plant medicinally
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Related plants
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