Are Mums Perennials?

Learn which mums you can count on to color your landscape for years to come.

Garden mums are hardy autumn bloomers.

Garden mums are hardy autumn bloomers.

Garden mums are hardy autumn bloomers.

Garden mums are hardy autumn bloomers.

Wondering if that gorgeous mum you bought is a perennial? You’re not alone. Mums are one of the more confusing plant groups (even their botanical name has changed several times). There are potted florist mums, which look just like garden (hardy) mums and even share the same botanical name (Chrysanthemum x morifolium)—and they’re perennials, but their survival depends on when you get them and where you live. Garden mums, also known as hardy mums, are perennial mums.

Cut-flower chrysanthemums, like spider mums or football mums, are perennials in Zones 5 to 9, and these types are becoming easier to find for sale online. And then there are the annual mums, yellow daisy (Chrysanthemum multicaule) and painted daisy (which has two botanical names: Chrysanthemum carinatum or Chrysanthemum tricolor). Is it any wonder you’re feeling a bit confused? So when you ask the question, “Are mums perennials?” the answer is a distinct yes—and no.

The group of mums that are hardy actually go by two different common names: garden mums and hardy mums. Garden mums is the wording of choice, and these are the gorgeous flowering plants you see at garden centers in fall displays with pumpkins and gourds. Garden mums boast intense flower power and bold petal hues, including shades like russet, copper, gold, violet and orange.

Garden mums—the reliably perennial mums—are hybrids of Korean chrysanthemums (Chrysanthemum indicum), which are usually hardy in Zones 4 to 8. The vast majority of garden mums (Chrysanthemum x morifolium) are hardy in Zones 5 to 9, although there’s a trick to getting those beautiful fall bloomers to overwinter successfully.

Perennial mums have two requirements for them to survive winter: early planting and excellent drainage. Early planting means the minute you see those spectacular mum pans (shallow pots) at garden centers, you need to buy them, bring them home and plant them. Aim to get them in the ground at the very start of fall (that’s early September in regions with cold winters—Zones 4-5). In fact, in cold regions the very best and ideal time to plant perennial mums is spring, but early fall is also a good window.

The second key to successful overwintering is good drainage. Perennial mums (garden mums) survive winter only when drainage is excellent. Add compost to planting holes and beds no matter what type of soil you have—heavy clay or well-drained loam. It’s worth the effort to ensure your garden mum snoozes through winter without dying.

There’s one last piece to the garden mum puzzle you should know. You may see some plant tags stuck in a garden mum pot that say “Dendranthema.” This is a botanical name that was being used for hardy garden mums, but that’s now been reverted back to “Chrysanthemum” by the official plant-naming folks.

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