Native pond-margin perennial with large glossy buttercup-yellow flowers in earliest spring above mounds of round dark green leaves.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 3–7 | −40 °C to −12.2 °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 3–7 | −34 °C to −7 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 1–5 | −15 °C to 10 °C | Plant tolerates down to this zone |
Growing notes
- Among the very first wetland flowers of spring — a key seasonal marker
- Important early forage for emerging bees and hoverflies
- Thrives in pond margins, bog gardens and seasonally wet ground
- All parts mildly toxic (irritant sap) — do not eat raw
Pet caution: Marsh marigold (Kingcup) is listed as potentially harmful to cats and/or dogs. Keep pets from grazing on it, and contact a vet if you suspect your animal has eaten some.
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Related plants
Cross-check Marsh marigold (Kingcup) against your zones