Chrysanthemum (Garden Mum) in Zone 9a & 9b

Chrysanthemum x morifolium

When to plant chrysanthemum (garden mum) in zone 9b

Zones 9a and 9b share the same average frost dates in our data, so this page covers both.

Method: Start indoors: Start indoors from seed, then transplant outside. Chrysanthemum (Garden Mum) needs a head start most zones can't give it by direct-sowing alone.

Start indoors	Dec 21–Dec 28
Direct sow / transplant outside	Mar 1–Mar 8
Estimated bloom	Feb 29 '28–Mar 7 '28 (First real harvest the season after planting)

Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-3 ft.

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.

How chrysanthemum (garden mum) fits zone 9's season

Zone 9b's frost-free window runs about 293 days, from February 15 to December 5. Chrysanthemum (Garden Mum) takes about 1 growing season to reach full flowering, so what matters here is how many of these seasons it gets, not whether one is long enough.

Chrysanthemum (Garden Mum) is hardy in zones 5-9, so in zone 9b it stays in the ground through winter and comes back rather than being replanted. Allow about 1.5 ft of spread at maturity.

Good companions

No standout companions recorded yet for Chrysanthemum (Garden Mum).

Where to buy chrysanthemum seeds

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