The Ultimate Guide to Fall Garden Mums

Updated: Apr 20, 2019



“If you would be happy for a lifetime, grow Chrysanthemums.” - Chinese Proverb


 

Garden mums (Chrysanthemum) are readily available in a wide range of colors for adding late season color to your garden or your front porch. With a little understanding and some simple tips, you can have a lush, beautiful garden mum display to help celebrate the changing of seasons.


The most common question we get asked about mums is if they are annuals or perennials. The answer is both. There are several species of chrysanthemums, with some being hardier than others. The mums we grow at our farm are perennial, garden-hardy mums selected for our growing zone here in Central Illinois. Because our mums are locally grown at our farm, they are healthy, strong, and acclimated to our climate when they leave our farm in the fall. There is no guarantee that the mums you purchase at our farm will come back the next year when they are planted in the fall. It all depends on how well they are cared for and when and where they are planted after they leave our farm. Whether you want to enjoy fall mums on your porch or plant in your garden, we've included everything you need to know in this guide for helping you with your green-thumb skills.


The Basics


In late summer when other plants call it quits, mums hit their stride. Like poinsettias, they're photoperiodic, meaning they rely on specific amounts of light to send the signal that it's time to start putting on a show. Garden mums are short-day plants and initiate flower buds in response to an interaction of day length, temperature and plant age. On average, garden mums will not start to set buds until the nights last about 10 hours long. Blooms follow in six to ten weeks.


Different mum varieties will come into flower at different times in fall, based primarily on their responses to day length. Early season varieties can be expected to come into flower in early to mid-September, mid-season varieties from middle to late September, late season varieties from late September to early October.


The best stage to purchase a garden mum is when the buds are just beginning to break open. Mums with fully open flowers are okay to buy, but be aware that they will not last as long in your garden or on your porch. Depending on weather conditions and mum varieties, you can expect to get a good display of color for four to six weeks once buds begin to break open. Extended periods of hot weather will age the flowers more quickly. If you plan to place mums in a shaded garden site, then it will be best to purchase mums with flowers that are more open, as mums that are in tight bud may not open properly when in the shade.


Most gardeners plant mums too late in the fall for the plants to survive over winter. Some of the mums may come back the next year if they are mulched for the winter. The shallow-rooted mums that are planted late in fall while in full bud or flower just do not have enough time to establish before winter sets in. We break down all the factors to consider when caring for and planting fall mums later in this guide.


Mum Facts


The Chrysanthemum is one of the most popular flowers in the world, next only to the rose. The name "chrysanthemum" is derived from the ancient Greek words chrysos, meaning gold with anthemon, meaning flower. Chrysanthemums were cultivated in China as early as 15th century BC. The plants were used as herbs and the roots and leaves were eaten. The Chrysanthemum was brought to Japan by Buddhist monks in 400 AD. Japanese emperors loved the Chrysanthemum flower that they sat upon Chrysanthemum thrones. Chrysanthemums - kikus in Japanese - were featured on the Imperial Crest of Japan. Mums were introduced into the United States in 1798 when Colonel John Stevens imported a cultivated variety known as 'Dark Purple' from England. Today, the plant is the quintessential autumn flower used for decorating, gardening, and as a gift plant.


Chrysanthemums are more than just a pretty face. The Chinese believe this flower represents ease and rest, and often use it as an object of meditation; and the Japanese consider it to be a symbol for life and happiness. Mum plants have also been shown to reduce indoor air pollution by the NASA Clean Air Study.


The chrysanthemum has its own traditional holiday, Chrysanthemum Day. This Japanese holiday is celebrated on September 9 - the 9th day of the 9th month - in locations throughout Japan, Korea, and Okinawa by viewing chrysanthemum displays, eating chrysanthemum cakes (a dumpling made from yellow petals mixed with rice flower) and drinking chrysanthemum wine.


Botanical Name: Chrysanthemum

Common Name: Garden mums, garden chrysanthemums, fall mums, hardy mums

Plant Type: Herbaceous perennial flower

Mature Size: 4 to 36 inches tall, 12 to 36 inches wide; size varies depending on variety.

Sun Exposure: Full sun

Soil Type: Humusy, fertile soil that is moist but well-drained

Soil pH: 6.5 to 6.7

Bloom Time: Late August to frost

Flower Color: Various shades of yellow, white, red, orange, purple, and bi-colors

Hardiness Zones: 3 to 9

Native Area: Native to Asia and northeast Europe; most species come from eastern Asia.


Types of Chrysanthemum

There are thousands of varieties of floral and garden mums. The varieties can differ in size, colors and number of flowers per stem. The National Chrysanthemum Society (U.S.A.) classifies mums into 13 groups based on the forms of their blooms and florets:


Class 1: Irregular incurve

Class 2: Reflex

Class 3: Regular incurve

Class 4: Decorative

Class 5: Intermediate incurve

Class 6: Pompom

Class 7: Single and semi-double

Class 8: Anemone

Class 9: Spoon

Class 10: Quill

Class 11: Spider

Class 12: Brush and thistle

Class 13: Unclassified types


For detailed descriptions of these National Chrysanthemum Society classifications, visit Chrysanthemum Classes.


Fun Facts

  • The November birth flower

  • The 13th wedding anniversary flower

  • National flower of Japan

  • The official flower of Chicago, IL and Salinas, CA

  • A popular Mother’s Day gift in Australia (May is in autumn)

  • The official flower of November in the U.S.

  • Used in teas to detox and treat the flu and headaches in some parts of Asia

  • Commonly used throughout the world in teas, salads, soups, and comfort food dishes

  • Known to bring happiness and laughter in the home according to Feng Shui

  • The largest commercially grown plant in the U.S.

So what makes mums so special? Maybe it’s because they are so versatile and come in virtually every color on the spectrum. Maybe it’s because they are deep rooted in history and carry much significance. Or maybe it’s because they are simply a beautiful flower. Either way, there is more to these autumn enchanters than meets the eye.


Caring for Potted Mums


Mums are generally considered low maintenance plants. Knowing how to care for mums properly simply requires basic gardening techniques. With just a little special care, your mums will be filled with a multitude of beautiful blooms.


To Re-Pot or Not

Our fall mums are grown in 9" or 12" pots at our farm. Many of our customers choose to leave their mums in the original pots. Be sure to check soil moisture daily and water mums when the top 1 inch of soil begins to dry.


Re-potting your mum can increase its longevity by expanding room for the plants roots. To re-pot, choose a container that is a little bigger than the original container. Fill the bottom of the new pot with a good quality potting soil. Break up any roots you can, but do not damage the roots.


When you put the plant in the new pot, the surface of the soil should be an inch below the lip of the new pot. Make sure you have soil, not air surrounding the roots. Tamp down soil gently. Give the pot a good watering until it flows out of the bottom of the pot.


Water, But Not Too Much

How often and how much water you give a mum can mean the matter of LIFE OR DEATH! Okay that sounds a little drastic, but it's the truth. When their leaves are drooping, which can happen ridiculously quickly, is an indicator of a watering issue. This is the leading cause of premature mum deaths.


If the weather has been hot for a period of time, test the soil by sticking your finger, up to the second knuckle into the soil to see if it feels dry. If it is dry, water your mum. The hotter and drier the weather, the more you will need to water. On the other hand, you can also over water your mum. If the leaves of your mum are drooping and the soil is wet when sticking your finger in the soil, then you are over watering it. During periods of rainy or cool weather, you will want to cut back to every other day when watering your mum, especially if the soil feels wet.


Deadheading

Deadheading is easy, but one of those tedious garden chores that almost as soon as you finish it, you have to start over again. When blooms begin to brown, just pluck them off to make room for additional buds waiting for light and room to break open. Your mums will look much better when finished and will bloom much longer!

Planting Fall Mums


Since mums bloom late in the season, they are nondescript, though not unattractive, in the border until blooming time. They are best planted next to early bloomers. As these spring blooming flowers fade, the mums will fill in and hide their unattractive fading foliage.

Mums make a wonderful impact in containers, but when planted in mixed borders, they will end your garden season with a bang when paired with other late season bloomers such as sedum, goldenrod, Russian sage, asters, gaillardia and the changing foliage of ornamental grasses.


For mums to be truly hardy, they need time to become established in the ground. Ideally, they are best planted in the spring and allowed to grow in place all season. When planting mums in the fall, it is best to plant them before they start flowering in late August or early September. Planting them before or during bud stage ensures that their energy is not completely going to their flowers yet.


When planting your mums, also consider planting them in a somewhat protected location where they will not be exposed to winter winds that can decrease their chances of surviving the winter.


Sunlight

Chrysanthemums are sun-loving plants. Although they technically require only 6 hours of sunlight each day, the more light they receive, the better their growth, bloom and hardiness.


Mums bloom due to their photoperiodic nature which means they bloom in response to the shorter days and longer nights. When the plant senses a change in the length of darkness in late summer, it begins to set buds. Planting near artificial lights, such as security lights or porch lights, can alter the bloom time of your mums.


Soil

Mums can survive in most soils, but they thrive in well-draining soil with consistent moisture. Growing mums in hard, dry soil prevents the roots from becoming well established, while wet, boggy soil drowns the roots. Finding the middle ground is key.


If you’ve planted other perennials, then you already know how to plant mums. To create a good soil for your mums, work your soil to a depth of 8 to 12 inches. Mix in 2 to 4 inches of organic material, such as compost or peat moss. The perfect soil texture can be tested by taking a handful and squeezing. When you open your hand, the soil shouldn’t clump or quickly fall apart. It should simply crumble. Mums like a soil pH slightly on the acidic side.


Spacing It can be tempting to plant mums closely together. Planted mums will reach up to 3 feet in height and width. Like many perennials, mums will often become larger each year. Even if your flower bed looks a bit bare when you first plant your mums, in time it will fill in.