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The best time to plant mums is in the spring, but you can also plant them in the fall depending on your goals for the flowers.
If you’re wondering how and when to plant mums so they come back year after year, spring planting gives the roots enough time to establish before winter arrives.
When you plant mums in the fall, they’re usually treated as annuals because they don’t have enough time to settle in before the ground freezes.
In this post, we’ll break down the best timing for planting mums, the step-by-step process for getting them in the ground, and the common mistakes to avoid so your mums thrive.
Let’s dig into the details of how and when to plant mums.
When to Plant Mums for the Best Results
When to plant mums really comes down to whether you want them to survive the winter or just enjoy them for a single season.
The timing also depends on your local climate and the type of mum you’ve purchased.
1. Spring Planting for Perennial Mums
If you want your mums to come back every year, you should plant mums in the spring after the last frost date has passed.
Spring planting gives the root system a full growing season to establish itself deep into the soil.
This strong root development is what helps mums survive freezing temperatures during the winter months.
When you plant mums in spring, you’ll also notice they produce more vigorous growth and a bushier shape by the time fall arrives.
Just keep in mind that spring-planted mums may not bloom as heavily in their first year because they’re focusing energy on root growth first.
2. Fall Planting for Instant Color
The most common time to plant mums for most gardeners is in the fall, usually from late August through October.
Fall is when garden centers are packed with those beautiful, blooming mums in every color imaginable.
When you plant mums in the fall, you get instant curb appeal and a burst of seasonal color for your porch or garden beds.
However, fall-planted mums are less likely to survive the winter because they haven’t had time to grow deep roots before the ground freezes.
If you live in a mild climate with warmer winters, you might get lucky, but in colder zones, treat fall-planted mums as annuals.
3. Climate Considerations for Planting Mums
Your USDA hardiness zone plays a huge role in when to plant mums in your area.
Gardeners in zones 5 through 9 have the best chance of growing mums as perennials, especially if they plant them in the spring.
If you live in zones 3 or 4, you’ll need to provide extra winter protection or simply plan to replant mums each fall.
The key is to plant mums at least six weeks before the first expected hard frost so the roots can get a head start.
Check your local frost dates to time your planting perfectly.
How to Plant Mums Step by Step
Once you figure out when to plant mums, the next question is how to plant mums properly so they don’t go into shock.
Mums have shallow root systems, so they need a little extra care during the planting process.
1. Choose the Right Location
Mums love full sun, so pick a spot that gets at least six hours of direct sunlight each day.
When you plant mums in too much shade, they’ll get leggy and produce fewer blooms.
Also, make sure the soil drains well because mums hate sitting in soggy ground.
If your soil is heavy clay, mix in some compost or aged manure before planting mums to improve drainage.
2. Prepare the Soil and Hole
Dig a hole that’s about twice as wide as the root ball but no deeper than the pot the mum came in.
This is crucial because planting mums too deep can cause the stems to rot at the base.
Loosen the soil at the bottom of the hole so the roots can spread out easily.
Add a slow-release fertilizer to the hole if you want to give your mums a gentle nutrient boost.
3. Plant Mums and Water Thoroughly
Gently remove the mum from its nursery pot and loosen the root ball with your fingers.
Place the mum in the hole so the top of the root ball is level with the surrounding soil.
Backfill the hole with soil and press down lightly to remove any air pockets.
Water deeply right after planting mums to help the roots settle in and reduce transplant shock.
Keep the soil consistently moist for the first few weeks but avoid overwatering.
4. Mulch Around the Base
Apply a 2 to 3 inch layer of mulch around your mums, but keep it a few inches away from the stems.
Mulch helps retain soil moisture, keeps roots cool in summer, and insulates them during winter.
If you’re planting mums in the fall, a thicker layer of mulch can also protect against frost heaving.
Common Mistakes When Planting Mums
Even when you know when to plant mums and how to plant mums, a few simple errors can ruin your display.
Here are the most common mistakes gardeners make and how to avoid them.
1. Planting Mums Too Late in Fall
If you plant mums too late in the season, the roots simply won’t have enough time to establish.
This means the plant will likely die over winter, even if it looks healthy at planting time.
Aim to plant mums at least six to eight weeks before your first hard freeze.
2. Planting Mums Too Deep
Burying the crown of the mum, where the stems meet the roots, is a fatal mistake.
When the crown is underground, it stays wet and rots quickly.
Always set the root ball slightly above the soil line if anything, never below it.
3. Forgetting to Pinch Back Mums
If you want bushy, full mums loaded with flowers, you need to pinch them back during the growing season.
Pinching means snapping off the top inch of each stem with your fingers.
Do this from early summer until about the Fourth of July to encourage branching.
This simple step makes a huge difference in how your mums look when they bloom.
So, How and When to Plant Mums?
Plant mums in the spring if you want them to survive the winter and come back as perennials.
Plant mums in the fall if you’re okay with treating them as annuals for a single season of color.
The best time to plant mums depends on your climate, your goals, and how much winter protection you can provide.
When you plant mums correctly, with full sun, good drainage, and the right depth, they’ll reward you with weeks of vibrant blooms.
Now that you know how and when to plant mums, you can confidently add these fall favorites to your garden.