After Flowering, What Should Be Done With Hardy Chrysanthemums?

Chrysanthemums are a popular plant for their beauty and ornamental value. They can be grown in pots or gardens, and after blooming, they can be placed in a larger pot to allow roots to expand. To maintain the plant’s growth, pinch off dead flowers with sharp scissors or small pruning shears. After flowering, enjoy the remaining fall display and encourage a second flower flush.

Chrysanthemums will stop blooming after around two weeks, so it is best to transplant them after blooming. Reduce watering and fertilization by ceasing fertilizer applications and cutting back on or completely stopping watering. Ongoing care involves pinching out the main growing point in early summer to encourage branching and pinching out the tips of sideshoots as they grow.

Chrysanthemums can be planted in ornamental borders and flower from late summer to autumn. Late-flowering chrysanthemums flower in winter and are grown as house plants. Once flowering is over, cut the whole plant down to 20cm (8in) tall. New plants can be made by taking cuttings in spring and dividing clumps.

To maintain the plant’s health, deadhead them, place them in a larger pot, plant them in your yard or garden, overwinter them indoors, and add them to your compost pile. Cut mums down to about 1″ – 2″ above the soil for winter protection. Fertilize when the plants are ready for blooming and discontinue fertilizing after flower buds are formed.

Pruning potted chrysanthemums after flowering to finger length and garden chrysanthemums after wintering to ¼ should be done.


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After Flowering, What Should Be Done With Hardy Chrysanthemums?
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2 comments

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  • Love mums! I always buy them potted for my porch and have been added them to the same flower bed at the end of the fall for a few years now. They’ve come back really well for me! I appreciate the bright pop of color in the garden, especially when other things are starting to look tired. Would love to try propagating them, thanks for the helpful article!

  • I’ve got a question for all that have Mums that DO come back and flower every year – Are these plants in a place that gets complete darkness during the time of flowering? (Or probably even preflowering times?) Here’s why I ask: Waaaay back in my early days of gardening, I worked in a grocery store floral department. At that time I was told by those “in the know” that the only way to get mums to flower was to have them in complete darkness for a certain number of hours per 24 hour period. Of coarse now, I cannot remember the exact # of hours that was!! But I think it was somewhere between 8-10 hours. The point being that if you had a street light shining down on them during the night, that this messed up their signals, and they refused to flower. By the same token, even if the mums had a porch light which wasn’t such a strong amount of light shining on it, they STILL wouldn’t flower. I’m quite sure that in nature, this long period of complete darkness is their signal that the seasons have changed, so time to get those flowers out there! Those are prolly the Fall blooming mums. But as far as the “complete darkness” thing, I still don’t have the answer! I must admit, I’ve never done the experiment! In this day and age of dark skies disappearing, I may never find out on my own… Anybody have any thoughts?