Growing Chrysanthemum (Garden Mum): A Complete Profile
By Growing Home Greens Team · August 20, 2026
Garden mums are sold in bloom in September and treated as decoration. NC State Extension lists them as perennial in zones 5 through 9, which means most of the country is throwing away a plant that would come back.
Why the pot ones usually die
A mum bought in full flower in autumn has put everything into bloom and has no time to root before winter. Planted in spring instead, or planted in autumn and mulched heavily, it establishes and returns.
Pinch until midsummer
Left alone, a mum flowers early on long stems and flops. Pinching the growing tips out repeatedly through early summer, stopping around the middle of July, produces the dense low mound that flowers in autumn. This is the single technique that separates a good garden mum from a sprawling one.
Sizes
One to three feet tall and one to two feet across, in full sun. Bloom is in autumn, triggered by shortening days, which is why it is reliable as the last thing flowering in a bed.
Source: NC State Extension Gardener Plant Toolbox, Chrysanthemum x morifolium.
Companion planting guide for Chrysanthemum (Garden Mum) · Find your planting dates
Typically viable in USDA zones 5-9. Not sure your zone? Look it up by ZIP code.
Mature height: 1-3 ft
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
When to plant chrysanthemum (garden mum), by zone
Every zone chrysanthemum (garden mum) grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 5a & 5b | Mar 15–Mar 22 | May 24–May 31 | First real harvest the season after planting |
| 6a & 6b | Feb 28–Mar 7 | May 9–May 16 | First real harvest the season after planting |
| 7a & 7b | Feb 13–Feb 20 | Apr 24–May 1 | First real harvest the season after planting |
| 8a & 8b | Jan 28–Feb 4 | Apr 8–Apr 15 | First real harvest the season after planting |
| 9a & 9b | Dec 21–Dec 28 | Mar 1–Mar 8 | First real harvest the season after planting |
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Chrysanthemum (Garden Mum) plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-3 ft.
Varieties worth considering
- Mammoth series (best for: cold-hardy, shrub-sized mums): Bred by the University of Minnesota, which has been breeding mums for winter survival since 1977, and rated reliably hardy in zones 3 to 9. Mammoth plants reach 3 to 4 feet across by their second year, carry thousands of flowers, and keep blooming into October thanks to their frost tolerance. The extension's advice is full sun and well-drained soil. (source)
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy chrysanthemum seeds
True Leaf Market · Burpee (each supplier's chrysanthemum seeds)
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See it growing
Search YouTube for "growing chrysanthemum (garden mum)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Chrysanthemum (Garden Mum): The autumn mums sold as disposable pots are perennial in zones 5 to 9 if you plant them properly.
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