Are Mums Perennials? How to Keep Garden and Potted Mums Coming Back

Updated November 5, 2026

Are mums perennials? Garden mums (Chrysanthemum × morifolium) are, in the right zones — but many still die their first winter. This guide covers garden mums vs florist mums, why fall-bought plants often fail, pot vs ground, and how to overwinter mums in the ground, a pot, a garage or a cool window, from university extension guides.

Jump to: Short answer Garden vs florist Why they die Pot or ground Overwinter in the ground Overwinter in pots While they bloom Next year

Are mums perennials?

Virginia Cooperative Extension: garden mums are “typically hardy in zones 5 to 9”, but “individual cultivars can vary in cold tolerance because of their complex genetic makeup. Winter survival may also vary with location, culture, site, or winter severity.” University of Illinois Extension: “While we commonly treat them as annuals, mums are hardy from zones 5-9”. Clemson HGIC lists them as a “Hardy perennial (commonly used as a seasonal annual)” for USDA hardiness zones 5a to 9b (spot-checked on the Clemson HGIC page Nov 5, 2026).

“most garden mums require some sort of winter protection to survive, especially their first winter.” (University of Missouri IPM)

Zones outside 5–9. The extension sources above give outdoor hardiness for zones 5 to 9. This page does not claim survival or death in zones 3–4 or 10–11. University of Missouri IPM: “look at a plant's care tag to determine its zone of hardiness rating”.

Garden mums vs florist mums

• Garden mums. Virginia Cooperative Extension: they “are no longer typically called hardy mums, but garden mums”.
• Florist mums. Also Chrysanthemum × morifolium, but “not bred for hardiness and therefore are not hardy when subjected to freezing” (Virginia Cooperative Extension).
• Bloom timing. Illinois notes that florists’ mums may need a longer dark period to bloom, so a killing frost can arrive before they flower (University of Illinois Extension).

Why mums die over winter

• Planted too late. “The biggest reason mums fail to overwinter is that we typically try to plant mums when they are most commonly available in the fall.” Spring is the ideal planting time (University of Illinois Extension). Virginia Cooperative Extension prefers the ground in late August or early September for root growth before freeze-up: “the later the mums are planted, the lower the survival rate”, and in fall’s short days mums are “programmed to be flowering at this time of the year, not producing roots”.
• Shallow roots and heaving. “Typically, mums die in winter because their shallow, fibrous root system may get frozen as the upper soil layers freeze”, and freeze–thaw can push the root ball up (University of Illinois Extension).
• Drought or wet soil. “Drought-stressed plants are less likely to survive the winter than well-watered plants.” Mums “cannot handle poor drainage” (Illinois); “Heavy, waterlogged soil can be detrimental during the winter months” (Virginia Tech).
• Too much shade. Shade makes perennial mums “more susceptible to winter damage”. Aim for at least 6 hours of direct sun (University of Illinois Extension; VT “6 or more hours”).

Mums in pots or in the ground?

“Container-grown mums are not well suited for perennial growth and will require extensive winter protection”. “Most gardeners choose to establish perennial plantings in garden beds or very large containers, as opposed to a smaller, single-plant pot.” (University of Illinois Extension)

University of Missouri IPM: potted mums planted into the garden after flowering have a “limited chance of survival” because they lack time to grow enough roots, even with mulch — so keep the whole plant protected in its pot if you want it back.

For frost-night cover and the hard-freeze line already on this site, see how to protect plants from frost. For which perennials to leave standing (including mums) vs cut, see which perennials to cut back in fall — this page does not repeat those FAQs.

How to overwinter mums in the ground

• Leave the stems. Keep foliage and stems on through winter. Virginia Cooperative Extension: until after the first hard frost. Iowa State University Extension and Outreach: “Do not cut back the plants prior to mulching”. University of Illinois Extension: once they are dormant, avoid cutting them back. Missouri differs: University of Missouri IPM says to “Cut back the tops of plants after leaves have turned brown each fall”. This guide follows the majority (leave stems) and notes Missouri’s view separately.
• Mulch after the ground begins to freeze. Virginia Cooperative Extension: 3–4 inches of light, airy mulch — pine needles, loose shredded bark, clean straw (not hay), or evergreen branches. University of Illinois Extension: apply 4 inches “when the ground begins to freeze”. Iowa State University Extension and Outreach: typically late November in central Iowa as one example; do not use leaves — they mat down. Look up your local first frost in the frost dates tables or ZIP planner rather than guessing a mulch date by zone.
• Remove mulch in spring. Leave it until “early to mid-April” (Iowa State; Virginia Tech and Missouri use the same early-to-mid-April window).
• Water into hard frost. Keep watering until the first hard frosts, then reduce; don’t let the soil go fully dry (Virginia Cooperative Extension).

How to overwinter potted mums

Three extension options:

• Garage or basement, dormant (University of Missouri IPM; Virginia Cooperative Extension). Cut back to several inches above the soil, then store in a basement corner or well-insulated garage where it will not freeze. Keep the mix “barely moist”; water lightly only when dry to the touch — “Do not saturate it or allow it to totally dry out.” Virginia Tech also lists an unheated basement or insulated garage where the plant will not freeze, plus a cold frame or greenhouse.
• Cool, dark spot after a hard frost (University of Illinois Extension). Illinois’s tip: after a hard frost, park the pot somewhere cool and dark, then bring it back outside when spring warms.
• Cool bright window (University of Missouri IPM; Penn State Extension). Missouri: about 40 to 45°F in a bright window. Penn State (spot-checked Nov 5, 2026): after flowers fade, move mums to a “cool but well-lighted location”, “Remove foil or other coverings from the pot”, and when the potting soil “dries to a depth of two to three inches, water it well so that water runs out of the hole in the bottom of the pot”.
• Spring planting. University of Missouri IPM: plant out “after the soil begins to warm” in about six hours of direct sun. Penn State: if there is new growth, wait until frost has passed and harden the plant off gradually before it goes out for good.

Potted mum care while it blooms

• Water by feel. Check soil by touch or pot weight before watering; wilting can mean under- or overwatering (University of Illinois Extension).
• Sun. Full sun — greater than 6 hours of direct sun daily — keeps plants bushy with more blooms; shade means fewer buds and a shorter show (University of Illinois Extension).
• Buy for bloom length. University of Missouri Extension: “Choose plants that are beginning to show color”. “These produce blooms for the longest time. Colors fade after heavy frosts.”
• Temperature. For light frost vs hard freeze on mums in pots vs the ground, use how to protect plants from frost (including the site’s existing 28°F hard-freeze line) rather than new numbers here.

Getting garden mums back next year

• Pinch. Pinch new growth at about 6 inches; make the last pinch around July 4 (University of Illinois Extension; University of Missouri IPM).
• Divide. Divide every few years in spring as new growth appears (University of Illinois Extension).

More guides

Protect plants from frost (mums in pots vs ground) Cut back perennials in fall What flowers to plant in fall All flower and bulb guides ZIP planner