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Hardy Mum

Hardy mum winter survival care tips

I had saved my hardy chrysanthemums in their original plastic pots and put the potted plants into the ground to over-winter. Now, I want to remove the plants from the plastic pots and transplant directly into the soil. My question is: When is the best time to do this? I live in Zone 4(Chicago area).

hardy mums

Not many of the “hardy” potted mums bought in autumn in zone 4 will survive the winter. Even though they are called hardy mums, their hardiness can vary. Cold winters and poor draining soil are some of the factors that have an affect on their survival. In addition, when growing mums for the market, growers pay more attention to color, shape and abundance of flowers than to cold hardiness. The result is a beautiful plant with a root system that cannot support it.

Planting in the fall, doesn’t always work because there may not be enough time to develop a good root system, so for any chance of success plant in early fall. Best time to plant hardy mums is in the spring. In your case, try transplanting in the spring, when the soil is workable; if any viable roots wintered over, you should see some green shoots emerge when the weather warm up. Otherwise, buy hardy mum plants in the spring and see how big they get by autumn.

To help hardy mums survive the winter outdoors cut them back down to 6″ after they are done blooming leaving some of the stems to trap winter snow for insulation. Also mulch your mums after a hard freeze with several inches of straw, pine needles or evergreens, the added insulation will protect the root system. Avoid using leaves as they tend to mat down and add little insulation.

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27 comments to Hardy Mum

  • Robin

    robin leger
    I was wondering what the botanical name is for garden mums.

    Garden mums is known as Chrysanthemum X morifolium, it has been currently renamed to Dendrathema X grandiflorum

  • Nancy

    I had beautiful mums planted and the deer nibbled the flowers off and more buds are forming. can I spray the plants with deer repellant without hurting the plant?? Also I planted Missouri Primroses in the fall,, which are perennial, will they sprout in the spring?? thanks for your help.. thanks for your help on getting my Peace lily to bloom for me with the right fertilizer you recommemded’ middle number higher then the first’

    Hi Nancy,
    It’s ok to use deer repellant on the mums. It should not hurt the plants. If you planted Missouri Primrose (Oenothera missouriensis) seeds, they will sprout in the spring and bloom the 2nd spring. If you planted the tuber-like root, it should return next spring and bloom. I’m glad your peace lilies are blooming-congratulate yourself !

  • JOan

    We have received potted mums as a gift. We are in Connecticut. They are currently in beautiful, large ceramic planters and these are outside on our front patio. We would like to care for them properly over the winter so that we can plant them in the garden in the spring. We have either dark rooms, or rooms windows that the sun comes through so strongly it burns anything we’ve put anywhere near them. Would it be too cold for them to winter in the garage ? There are windows and the garage is attached, so nothing in there actually freezes.
    What else do we need to do? trim them? water ?
    Thank you.

    The best way to winterize your mum is to keep it dormant. A gargage will work as long as it doesn’t get too much below freezing in the dead of winter. Trim back the plant as it will die back anyway. We want to protect the crown and roots of the mum. Use straw/ mulch on top of the plant for additional protection. Wrap the container with some kind of insulation (bubble wrap, plastic)to keep the roots from cold damage. Check on it periodically during the winter and give it just enough water to keep the roots moist.

  • Nicole

    I planted some hardy mums in pots with coleus. After a few weeks, the blooms died and I haven’t had any more, but the plant seems to be healthy. How can I get them to bloom again?

    Generally, once your mum is done blooming that’s it for the season but you may still get a few more flowers by deadheading the old flowers. There may be more flower buds under the spent flowers.

  • Jenni

    I recently received a potted mum from a garden center - just the spring flower displays of potted plants. Since it has absolutely no information on the pot to identify the mum, is there any way for me to know if the mum is a hardy variety or an annual? I want to plant it outdoors permanently, but if it is an annual it might turn out to be wasted effort.

    Hi Jenny
    If the mum has bright large flowers on it then most likely it’s a greenhouse plant and not hardy. Hardy garden mums usually have smaller flowers not as showy as the greenhouse variety and would be sold(in Northern states) as small green plants with a few blooms or none at this time of year. These would be planted in spring to get a full season’s growth before they bloom in the fall. You can plant the greenhouse mum in the garden and it might rebloom in e. fall but will not winterover.

  • Rebecca

    My fiance gave me a mum for Mother’s Day. It actually has three plants in the pot: one yellow; one pink; and one light purple — very pretty. We live in southwest Missouri. Can I plant it outside?

    I’m guessing that it is a greenhouse mum that may not winter over but you can plant it outdoors at this time and it should grow all summer long . If you’re lucky, it may rebloom in the fall.

  • Rebecca

    How nice to get such a quick response! Thank you - I appreciate the help and information. :)

  • vickie

    I have bought 2 mums from a popwarner football fund raiser..can i plant these mums into a pot then into the ground after flowering and hope they’ll come back or will this lessen the chances and they should be directly into the ground first…thank you

    Hi Vickie,
    If you want any chance of them coming back you should plant them in the ground so that they have enough time to establish a good root system before winter. If you want to enjoy them in a container- here’s what you can do. After the mums are finished blooming, instead of planting them in the ground, keep them in the container and move your mums to a cool place such as an unheated garage. Water occasionally, just enough to keep them from drying out completely. When you see new sprouts of growth in spring, remove any dead, dried stems and plant in the garden.

  • Reema

    Hi,

    I bought some mum plants from Lowe’s. They were v.pretty when I bought them but as the days passed they lost their color and they no more look healthy. I have other mums that I planted last year and I managed to keep them alive thru the winter by keeping them in the apt.Today to my horror, I discovered that the plants I got recently have some insects and worms on them. I don’t know what pesticide I shud use… I am worried that it may spread to the other plants I have…I live in CA

    Hi Reema
    How disappointing that must be. Not knowing what type of insects are eating your mums makes it difficult for me to recommend any type of pesticide, especially if it’s used indoors. I would isolate the mums from other plants just to be on the safe side. If you have an extension office nearby, take the insect to them for ID. Your other option is to return the buggy mums to Lowe’s.

  • Reema

    Hi, Thanks for the response… the insects r really tiny… smaller than mustard seeds.I’ve seen such insects on rose plants back home…. and there r some brown worms in them too…The plants r outdoor but I may have to keep them inside during winter. I have a toddler at home and am 8 months pregnant.. Anyways, I am clueless ..I don’t have the receipts either…Reema

    Hi Reema
    Do the tiny insects move-jump? The brown worms may be beet armyworm larva which feed on the flower as well as leaves and can be treated with Bacillus thuringiensis sold as Dipel, Bactur, Thuricide. BT is a biological control which the caterpillars must eat to be effective. Spray the plant when they a feeding. Once the caterpillar chews on the leaves and eats the parasitic bacteria it will die within 24 hours. Its possible that the black mustard seeds can also be caterpillar excrement.

  • Kenya

    Pinching Mums
    I want to buy hardy mums to plant in my front yard next year where there is currently grass. 3 questions: When is the best time to buy a hardy mum? When I dig up the grass/dirt to plant the hardy mums, will there be a regrowth of grass? How do you pinch a hardy mum?

    Hi Kenya
    Best time to plant hardy mums is in the spring. Buy small plants and see how large they get by fall. To keep the weeds /grass from regrowing, try laying thick layers of newspaper and then 2″ of wood chips on top of the soil, after you plant your mums. It works great. The newspaper will eventually decompose. Pinch your mums in June or when the plants are 6-8 ” tall and again before July 15 before buds begin to form. To pinch-nip out the growth center. Pinching will stimulate more branching and produce a fuller, stockier plant. If you want larger flowers, remove all but 1-2 buds. This will focus more nutrients to the 2 buds that are left producing bigger but less flowers. If you want to plant hardy mums in the fall, see the article above.

  • Faith

    I got a Pelee Mum for my birthday in Sept. and I was wondering if I can plant it outdoors now or do I have to wait. I live outside of Portland in Oregon. Thank you for your help.

    Hi Faith
    Pelee mum is hardy in zone 7-10. You may be able to plant it outdoors in Oregon. Be sure to mulch it well after a freeze to protect any roots.

  • Jeff

    Hardy Mum

    My mums were eaten last year is there anythign I can spray or put on them in them to protect them.

    Hi Jeff
    Do you know what ate your mums? Was it an insect or an animal? There are some deterants for rabbits and squirrels that you can buy or mix.

  • Linda Taylor

    I live in southern new jersey , should i leave my mums in pots now until next spring.

    Hi Linda
    It is late to plant them outdoors in colder regions. If you are in zone 7 there is a chance that your mums may or may not have enough time to produce some roots for the winter. Check with your neighbors. Be sure to mulch them well after the ground freezes. You can try to winterover your hardy mums in an unheated garage. Protect the pots by cover them with some type of insulation. The important thing to remember is to keep the roots from freezing and totally drying out. So check the plants periodically during the winter and add a bit of water.

  • Lorraine

    I live in South Carolina and received a mum in a pot as a gift about a week ago. I would like to transfer it from the pot and plant it my yard. When is it ok to do this or should I leave in pot until a certain time?

    Hi Lorraine
    You can plant your potted mum in the yard now. It will have enough time to build up new roots before the cold weather sets in in S. Carolina.

  • Tina

    I live in Southwest Arizona and would like to plant the potted mums purchased for Halloween outside in the ground now. Will they survive and bloom again next fall?

    HI Tina
    I would plant them asap so they can get established. They should be hardy enough to with stand SW AZ. winter and survive. Protect the plants if there is a eminent frost predicted.

  • susie

    I bought four mums for display thru the autumn, in pots. Now they are “dead” in the pots. I was told they will come back. What do I do with them. Keep in pots and wait till spring to transplant or transplant now? I live in southern Indiana?

    HI Susie
    It’s too late to plant them in the ground wait till spring. Store your mums in the garage or protected area to keep it from freezing and water occassionally during the winter. If it survives then there may be a chance that it will come back next season. For more info read the above article.

  • Colleen

    In fall of 2007 we planted Hardy mums from pots we purchased at the nursery. They did well and in spring of 2008 we saw green foliage under the deadness (for lack of a better term) and the old plant just sort of pulled out of the ground uncovering the new mums. We allowed them to do their thing and by fall these massive mums were 4 feet in diameter and bloomed like crazy. Beautiful. This year the green growth is appearing, however the old dead plants are so large and rooted that when we tried pulling them up the new growth was attatched and its damaging the plants. I know so little about doing this I am sort of stuck. Also, how do I keep them from becoming so huge and taking over my flower bed? Thank you in advance.

    Hi Colleen
    The new growth is attached to the old plant. It’s better to trim the dead stems down to the ground and let the new growth take over. I had the same problem with some of my perennials and end up accidentally pulling out the new growth. I usually dig a small hole the replace the new growth, hoping it will survive. If your plants are too big, you can divide them. If they get too tall, pinch them back several times during the growing season. Pinch them back in June and again before July 15 to produce bushier plants and more flowers.

  • Julianne

    I have a mum from my grandfather’s funeral that I would love to plant and care for properly so it lives on in his memory. Right now it is in a plastic planter, but would like to transplant it to the ground.

    It has dark purple flowers, and three plants that go into the dirt. There are no markers in the plastic tub to identify the mum - is this an annual or a perennial?
    I live near Des Moines, Iowa (which I looked up to be zone 5a).
    If someone could tell me how to best care for this plant, I would greatly appreciate it.

    Hi Julianne,
    Sorry to hear about the loss of your grandfather. The mum you have is most likely a greenhouse mum not hardy in zone 5a. You can plant it this spring and let it grow outside but it will not winter over. Sorry.

  • Tyler

    I live in central illinois and we have purple and yellow mums on our football field ends. Our Purple ones come back but the yellow ones do only about 1/4th of the time if not less. Does color play a factor? What could be the problem?

    Hi Tyler
    Color could be one factor as well as variety. Some cultivars may be hardier such as your purple colored mums.

  • Spring blooming mums

    I have a green house in NC and have been using cuttings (Mums)to get more.
    Some of my mums are flowering now. (daisy and some cushion and Bonsia)
    Will these also bloom in the fall?
    Or will they continue to bloom until winter.??
    Is it a good Idea to plant a mum in the spring when they are at least a foot high or higher??
    Thanks
    Todd

    Hi Todd
    Enjoy your spring flowering mums and after they are done blooming cut the plants back by 1/2-1/3 to control the height and plant them outdoors for fall bloom which is their natural blooming season. Pinch your mums in June and again before July 15 before buds begin to form. To pinch-nip out the growth center. Pinching will stimulate more branching and produce a fuller, stockier plant.

  • Jenny

    Do mums like sun or can I plant in the shade? I am in WI.

    Hi Jenny
    Mums grow best in full sun but will tolerate some partial shade. They prefer well drained rich soil and do poorly in clay soil.

  • Donna

    Hardy Mum seeds
    Hi, I would like to start hardy mums from seeds instead of dividing the plants. Do you know where I could buy hardy mum seeds? I have not seen any for sale in stores. Thanks

    Hi Donna
    You have to order hardy mums from a catalog (Park seed) or internet.

  • Lisa

    I moved at the end of last summer and found that I have hardy mums in my new flower bed. I never had a garden before, but I read somewhere that you could use the cuttings after you’ve pinched back the mums to start new roots. I would like to use them to fill in some gaps from a bush I removed, so I placed them in some water and have them in a window that gets morning sun. Should I be doing something else to get them to root? How long before I know if this is actually working?

  • Nicole From Pine Grove

    Do you know a website that sells hardy mum seeds,getting very frustrated loking for hours only finding plants not seeds. HELP!!!!! thanks

  • Kathy Ernst

    Leaf spot disease
    I have Mums that return each year. This year, many of the leaves are getting lots of dark spots that show through the leaves top and bottom. What could that be?

    Hi Kathy
    It sounds like a leaf spot disease caused by a fungus usually prevalent in rainy weather. The leaves will exhibit transparent , brow or black spots. To control it, remove all infected leaves to keep it from spreading. Any major infection should be removed. Mulch around the soil to keep the spores from splashing up onto the plant. If this is a presistant disease (year after year) then start spraying the plants with a fungicide(wettable sulfur or bordeaux mix). Follow manufacturers directions. The fungus overwinters in soil debris, so be sure to clean-up well in the fall.

  • Peggie Heisey

    I have numerous mums & I usually cut them back twice a season & this year I’m behind and only getting it done once. I am tempted to not do them all. Will it matter? What will happen? I’m thinking they may just bloom in summer. Most all of mine are so tall & thick & I’m growing weary.

    Hi Peggie
    By cutting your mums you keep them from getting too tall and will get more flowers.

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