How to Care for Chrysanthemums and Keep Mums Blooming All Fall

Whether you’re styling a fall porch with potted mums or trying to get your garden chrysanthemums to look their best, there’s a lot you can do right now to extend the color. Often called the queen of fall flowers, chrysanthemums thrive in the crisper, shorter days of autumn — but they still need thoughtful care to stay vibrant. Here’s what gardening experts recommend.

1. Allow Plenty of Sunshine

When you’re planning your outdoor fall display, think carefully about placement. Chrysanthemums need at least six hours of direct sunlight daily to flourish, whether they’re in the ground or in containers. Choose a spot with good air circulation and avoid crowded areas where foliage stays damp for long periods — that’s a prime breeding ground for disease.

Sharon Murphy, founder of Gardening with Sharon and a third-generation greenhouse grower with over 30 years of experience: “Place nursery-grown potted chrysanthemums in sunny areas of a deck, patio, or porch where they will get their fill of sunshine.”

2. Water Plants Deeply

Unless your area has had significant rainfall, your mums will likely need regular watering. The ground is often still dry in fall, and potted plants dry out even faster because their roots are confined to a small amount of soil.

Jessica Hall, co-founder of Harmony Harvest Farm: “Keep watering your mums deeply once or twice a week for as long as the flowers are still blooming. Maintaining consistent moisture will prevent drought stress. Mums are very, very thirsty but they don’t like wet feet, so water when the top two inches of soil is dry.”

A thorough soaking less often is far better than frequent light sprinkles, especially for in-ground plants. Soaking encourages roots to grow deeper and helps the plant resist drying out between waterings. Just avoid splashing water over the foliage and flowers to prevent disease. If planting in containers, choose a larger pot than the one the plant came in, and always make sure it has drain holes.

Tim Pollak, Manager of Plant Production at Chicago Botanic Garden: “Don’t rely on rain — the plants are full and create an umbrella effect over the root zones. Water thoroughly as often as required.”

3. Feed Mindfully

Mums planted in flower beds may benefit from a light feeding this month, but go easy and choose a low-nitrogen formula. Switching to a bloom booster with higher phosphorus and potassium encourages flower production rather than leafy growth. You can feed once or twice during the fall, which also promotes root growth and may help perennial mums survive the winter.

Sharon Murphy: “Too much nitrogen late in the season can encourage soft, leafy growth when what we really want is flowers. Avoid heavy feeding in late summer and fall. Also, flowering potted chrysanthemums do not require additional fertilizer.”

Stop feeding as soon as your mums begin to bloom.

4. Deadhead and Disbud

Removing spent flowers keeps the plant tidy and may reveal unopened buds underneath. In the garden, simply snip off faded flower heads just above a healthy set of leaves or branching point. You don’t need to be aggressive — a quick tidy-up every few days is enough.

If you want larger, show-quality blooms, you can also “disbud” by removing side buds so the central flower grows bigger. For potted mums, which typically bloom once and are done, removing older faded flowers simply keeps the display looking fresh through the fall.

5. Protect Your Mums From Frost

Chrysanthemums enjoy cooler weather, but their flowers are far more vulnerable to frost than the plant itself. Keep an eye on the forecast and have a frost cloth ready.

Sharon Murphy: “A light frost doesn’t necessarily mean the end of your perennial chrysanthemums. Protecting the plants from repeated frosts can buy you considerably more flowering time.”

When a frost warning is issued, cover in-ground mums with a lightweight frost cloth, old sheet, or breathable material resting on stakes before temperatures drop. Remove the covering once temperatures rise above freezing the next morning. Potted chrysanthemums do best when protected from all extremes — gather them into a sheltered spot during frost warnings and return them to their sunny spot once the weather warms. As cold weather becomes consistent, nursery-grown containers naturally decline, and that’s perfectly normal.

6. Buy Potted Plants in Bud

To get the longest display from potted mums, purchase plants before they’re fully open. Choose specimens with mostly unopened buds and just a few flowers beginning to show color. At this stage the plants are already at full size, so the blooms you see are what you’ll get — look for the freshest plants available and avoid older or heavily discounted stock, since most stores restock weekly.

Tim Pollak: “At this point, the plants are already fully grown and won’t get any larger. Most stores bring fresh plants every week, so try to purchase the freshest plants and stay away from the older or discounted plants.”

In colder zones, nursery-grown pots are definitely the way to go, as chrysanthemums are typically hardy in zones 5–9. Remove any finished flowers on arrival to encourage unopened buds to open.

With chrysanthemums, the range of colors and cultivars is vast — from small daisy-like flowers to large, blousy blooms in soft or bold shades. This versatility lets you flex your creativity for a stunning fall display. As Sharon Murphy puts it, “Chrysanthemums don’t ask for much, but they reward a little attention with weeks of colour when many other garden plants are calling it quits. Keep the roots evenly moist, deadhead regularly, give them plenty of sun, and protect the flowers when frost threatens. With a little care, you can keep that burst of autumn colour going long after the first cool nights arrive.”

Featured Planters for Fall Displays

With the right placement, watering, feeding, and a little protection from frost, your chrysanthemums can deliver weeks of vibrant fall color. If you love garden inspiration and outdoor advice, consider signing up for a gardening newsletter to get the latest features delivered straight to your inbox.

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