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Garden chrysanthemum is a forgiving autumn perennial, hardy in USDA zones 5-9 (RHS H4-H5), that flowers from late summer to hard frost. It is short-day: buds form only once nights lengthen, so pinch the tips every few weeks until midsummer and then stop completely. Pinching after that removes the flower buds. Give it full sun and free-draining soil, as winter wet kills more plants than cold. Toxic to cats and dogs because of its pyrethrins. Plants cost $6-$20.
Key facts
- Short-day plant: flower buds are triggered by lengthening nights in late summer, not by temperature. Streetlights or porch lights nearby can genuinely delay or prevent flowering.
- Pinch growing tips every 2-3 weeks from spring until midsummer to build a dense mound, then stop. Pinching later removes the developing buds.
- Toxic to cats and dogs. Chrysanthemums contain pyrethrins, sesquiterpene lactones and other compounds causing vomiting, diarrhoea, drooling and skin irritation.
- The pyrethrins in a related species (Chrysanthemum cinerariifolium) are the source of commercial pyrethrum insecticide.
Care requirements#
| Plant type | Herbaceous perennial; often sold and used as a disposable autumn container plant |
| Growing medium | Fertile, free-draining garden soil or container compost |
| Light needs | Full sun, at least 6 hours; keep away from night-time artificial light, which disrupts bud set |
| Water frequency | Keep evenly moist in summer; container plants in flower may need daily watering |
| Hardiness zone (USDA) | 5-9 for hardy garden types; florist pot mums are less hardy and often treated as annuals |
| Hardiness zone (RHS) | H4-H5 for garden hardy types; H3 for florist types |
| Bloom season | Late summer to hard frost, peaking through autumn |
| Temperature range | 16-24°C (60-75°F) growing; flowers tolerate light frost, blooms damaged below about -2°C |
| Fertilizer | Balanced feed monthly through spring and early summer; stop feeding once buds show colour |
| Soil pH | 6.0-7.0 (slightly acidic to neutral) |
| Drainage needs | High: waterlogged winter soil kills far more plants than freezing does |
| Toxicity | Toxic to cats and dogs (pyrethrins and sesquiterpene lactones); causes vomiting, diarrhoea, drooling, incoordination and contact dermatitis |
Growth & propagation#
| Mature size | 45-90cm tall and wide; cushion types stay under 45cm |
| Growth rate | Fast in spring and summer |
| Propagation methods | Basal cuttings taken in spring, or division of the clump every 2-3 years |
| Propagation difficulty | Beginner-friendly; spring basal cuttings root in 2-3 weeks |
| Repotting schedule | Divide and replant garden clumps every 2-3 years to keep them vigorous |
| Pruning timing | Pinch the top 2-3cm off each shoot every 2-3 weeks from spring until midsummer, then stop entirely. After flowering, leave the top growth on over winter as frost protection and cut it back to 10cm in early spring. |
Common problems & troubleshooting#
| Symptom | Likely cause | Fix |
|---|---|---|
| Plant grows well but never flowers | Pinched too late in the season, or exposed to artificial light at night | Stop all pinching by midsummer and move containers away from streetlights and porch lights |
| Winter losses despite being in a hardy zone | Waterlogged winter soil rotting the crown | Improve drainage, plant in spring rather than autumn so roots establish, and leave the top growth on over winter |
| Pale mottling and tiny webs on leaf undersides | Spider mite, common on stressed container plants | Increase watering consistency, hose down foliage, and treat with insecticidal soap |
| Tall stems collapsing after rain | Unpinched, over-fed growth | Pinch through early summer to build a self-supporting mound, and reduce nitrogen feeding |
Stop pinching at exactly the right week
Sodate tracks your daylength and tells you when to make the last pinch so the buds actually form.
Seasonal care#
Varieties & cultivars#
| Variety | Distinguishing trait | Note |
|---|---|---|
| Cushion mums | Low dense mounds under 45cm | The standard autumn container mum in North America |
| Decorative and reflex types | Large full blooms on 60-90cm stems | Grown for cutting and exhibition; usually disbudded |
| Spider chrysanthemums | Long tubular, curling ray florets | Show favourites; need shelter from wind and rain |
| Korean hybrids | Single daisy-like blooms, very hardy | The most reliably perennial garden group in cold zones |
Buying checklist#
- Mostly tight buds rather than fully open flowers, for a longer display
- Dense, even mound with no bare centre
- Compost moist and roots not tightly circling the pot
- Ask whether it is a hardy garden mum or a florist pot mum, if you intend to plant it out
Pricing by region#
| Region | Price range | Typical unit | Basis |
|---|---|---|---|
| US | $6 – $20 | 1 gallon / 8in pot | Garden centre + big-box autumn retail |
| UK | $5 – $16 | 2-3L pot | Garden centre retail |
| India | $1 – $4 | 6in pot | Urban nursery retail |
| Australia | $7 – $20 | 150-200mm pot | Nursery retail |
| Canada | $7 – $20 | 1 gallon pot | Garden centre retail |
USD figures are approximate conversions for comparison; switch the dropdown to see each region's actual local-currency listing price.
Often confused with#
Where it's actually grown#
Chrysanthemum is one of the largest cut-flower crops in the world. Cuttings are produced by breeders such as Dekker and Deliflor from stock nurseries in Kenya, Uganda and Brazil, then finished in the Netherlands, Colombia and, for the domestic market, in India and China.
Import & biosecurity restrictions#
| Region | Note |
|---|---|
| Australia | Live plant imports restricted; strong domestic production, with a large market peak around Mother's Day in May. |
| US | Unrestricted domestic sale; the defining autumn container plant across the country. |
| UK | No restriction on sale; hardy garden types and florist pot mums are both widely available. |
| India | No restriction; a major commercial loose-flower crop for garlands, especially in Karnataka and Tamil Nadu. |
| Canada | CFIA rules apply to commercial imports; hardy Korean hybrids suit colder provinces best. |
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Frequently asked questions
Are chrysanthemums toxic to cats and dogs?
Yes. Chrysanthemums contain pyrethrins and sesquiterpene lactones, which cause vomiting, diarrhoea, drooling, incoordination and skin irritation in cats and dogs. Keep pots out of reach of pets that chew plants.
When should I stop pinching chrysanthemums?
By midsummer. Pinch every 2-3 weeks from spring to build a dense mound, then stop completely. Pinching after midsummer removes the flower buds that are already forming.
Why won't my chrysanthemum flower?
Either it was pinched too late, or it is getting artificial light at night. Chrysanthemums are short-day plants that set buds only when nights lengthen, so a nearby streetlight or porch light can prevent flowering entirely.
Will an autumn pot mum survive the winter?
Hardy garden mums usually survive in USDA zones 5-9 if planted in free-draining soil. Florist pot mums sold in bud for autumn display are much less hardy and often do not return. Winter wet kills more plants than cold does.
How much does a chrysanthemum cost?
A 1-gallon or 8-inch autumn pot typically costs $6-$20 in the US and £4-£13 in the UK.
