Illustration
Bronze Mum
Chrysanthemum 'Bronze'
Bronze Mum blooms from September through November.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Bronze Mum
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 5–9. Expect it to reach about 24 in tall and 24 in wide at maturity, in roughly 1 year (not yet checked).
What was checked
Mature height and spread, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not, and each fact above says which. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Bronze Mum
Plant Bronze Mum in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 7, the middle of its hardy zones 5 to 9, spring means March to May and fall means September or October. Once settled, it blooms from September to November.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 7, the middle of this plant's hardy range, start with zone 7 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Bronze Mum get?
24 intall5 ft 7 inan adult24 inwideSee Bronze Mum in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Bronze Mum
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Bronze Mum about 24 in apart, center to center, so each plant has room to reach its full width.
Add Bronze Mum to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Bronze Mum's height, spread, hardiness zones, sun and trait tags were checked against 7 published sources on July 30, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- NC State ExtensionPlant Toolboxheight, spread, hardiness zones, sun, years to mature size and trait tags
- NC State Extensiongenus entryheight, spread, hardiness zones, sun, years to mature size and trait tags
- nvknurseries.comNVK Nurseriesheight, spread, hardiness zones, sun, years to mature size and trait tags
- Clemson Home and Garden Information CenterClemson Cooperative Extension Home and Garden Information Centerheight, hardiness zones, sun and years to mature size
- University of Florida IFASUF/IFAS Gardening Solutionsheight, sun and trait tags
- RHSRoyal Horticultural Society (genus guide)sun and trait tags
- RHSRoyal Horticultural Society (growing guide)sun and trait tags
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Bronze Mum
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses, and a skin irritant to people. Eating it usually causes mild stomach upset, drooling and diarrhea; NC State rates it low-severity. per ASPCA and NC State
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.