Compact pungent-leaved annual with small orange, yellow or mahogany flowers. The classic vegetable-bed companion plant for nematode suppression.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 2–11 | −45.6 °C to 10 °C | Zones where it can be grown as an annual — not a frost-tolerance rating |
| RHS hardiness rating | H2 | 1 °C to 5 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 2–9 | −40 °C and warmer | Zones where it can be grown as an annual — not a frost-tolerance rating |
| Australian (ANBG) zone | Zone 1–7 | −15 °C and warmer | Zones where it can be grown as an annual — not a frost-tolerance rating |
As a tender annual, French marigold doesn't overwinter — the zone range shows where the growing season supports it. See the RHS rating for its actual cold tolerance.
Growing notes
- Root exudates suppress root-knot nematodes in soil — effect is scientifically verified but requires a full season of growth in the affected ground
- Forage for hoverflies and other small pollinators
- Pungent foliage scent is strongly disliked by some flying pests (whitefly, aphids) although the effect is unreliable
- Distinct from pot marigold (Calendula) despite the shared common name
Pet caution: French marigold 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.
Categories
Related plants
Cross-check French marigold against your zones