Every fall, I get the same urge.
The weather finally starts cooling down a little here in the South, I walk outside, look at my flower beds, and suddenly I want to cut everything back and clean everything up.
After months of heat, rain, weeds, overgrown plants, faded flowers, and plants flopping all over each other, a freshly cleaned flower bed sounds pretty good.
But I’ve learned over the years that fall is one of those times when doing less can actually be better for your plants.
In fact, there are quite a few plants in my own yard that I purposely leave alone in the fall.
Some shouldn’t be pruned because you could accidentally remove next year’s flowers. Others benefit from keeping their foliage through winter. And a few simply don’t need us messing with them yet.
So before you grab the pruning shears and start giving everything in the flower bed a haircut, here’s what I do with some of the plants growing around my own home.
First: Don’t Let an Ugly Flower Bed Make You Prune Too Much
This is probably the hardest part for me.
By late summer and early fall, my flower beds don’t always look like they did back in April and May.
That’s gardening in the South.
We’ve just put these plants through months of intense sun, high humidity, thunderstorms, insects, and temperatures in the 90s.
Some plants are still blooming beautifully. Others look tired.
And when a plant starts looking tired, our first instinct is often:
“I need to cut that thing back.”
Sometimes you do.
But sometimes that’s exactly the wrong thing to do.
Here’s how I handle some of the most common plants in my own landscape.
1. Hydrangeas — Be Very Careful With the Pruners
Hydrangeas are probably the plant I would be most cautious about pruning in fall.
I have hydrangeas at my house, and once we get toward fall, I mostly leave them alone.
The reason is simple: some hydrangeas bloom on old wood.
That means the stems you’re looking at this fall may already contain the buds that will eventually produce next year’s flowers.
Cut those stems off at the wrong time and you may spend next summer wondering:
Why isn’t my hydrangea blooming?
For my hydrangeas, fall is mostly a hands-off season.
I’ll remove something that’s obviously dead or broken, but I’m not walking around shaping the bushes and cutting healthy stems back just because they’re getting a little unruly.
One important exception is that not every hydrangea blooms the same way. Panicle hydrangeas, for example, bloom on new growth and can be pruned differently.
That’s why knowing what kind of hydrangea you have is much more important than following a blanket rule that says “prune hydrangeas in fall.”
When in doubt, I leave mine alone.
2. Canna Lilies — Don’t Be in a Hurry
If you’ve followed Garden Down South for very long, you probably know I grow cannas.
Cannas can start looking pretty rough toward the end of the season. Leaves get torn, flowers fade, and the plants can start losing that beautiful tropical appearance they had earlier in summer.
During the growing season, I absolutely clean my cannas up.
I remove spent flowers and ugly leaves, and I cut old flowering stalks when they’ve finished doing their thing.
But I don’t automatically cut the entire patch to the ground just because the calendar says fall.
Here in the South, cannas can keep going for quite a while.
As long as the foliage is still green and healthy, it’s still doing its job.
Once cold weather or frost finally knocks the foliage back, that’s when I’m much more willing to cut everything down.
Until then, I let them keep growing.
3. Daylilies — Remove the Ugly Stuff, Not Everything
I have grown daylilies for years, and these are another plant where I don’t feel the need to scalp them in early fall.
I do clean them up.
If I see yellow leaves, brown foliage, old flower stalks, or leaves that pull away easily, I’ll remove those.
What I don’t do is take a hedge trimmer and chop every daylily down to a few inches just because summer is ending.
The green foliage is still feeding the plant.
I prefer to let the plant tell me when it’s finished rather than forcing it into dormancy according to my calendar.
4. Coneflowers — Leave Some Seed Heads
This is one of those places where a slightly “messier” garden can actually be a better garden.
After coneflowers finish blooming, the seed heads aren’t particularly pretty compared with the flowers.
But birds don’t care whether they’re pretty.
Those seed heads can provide food, and leaving some standing stems also adds a little structure to an otherwise empty winter flower bed.
You don’t have to leave every single stem standing.
I usually compromise.
I’ll clean up anything that’s broken, diseased, or particularly ugly and leave some healthy seed heads behind.
That’s one of the things I’ve changed about the way I garden over the years. I don’t feel like every flower bed has to look freshly manicured twelve months out of the year.
Sometimes leaving a little bit behind is actually beneficial.
5. Black-Eyed Susans — Let Some Seeds Stay
I treat black-eyed Susans much like coneflowers.
It’s tempting to remove every brown flower head once blooming slows down.
But if you leave some of them, you’re giving the plant an opportunity to reseed.
And that’s one of my favorite things about certain perennials.
Free plants.
If they’re growing somewhere I like, I’m perfectly happy to let nature help fill that area in.
I’ll tidy up the worst-looking stems, but I’m not necessarily cutting every black-eyed Susan down in September.
6. Salvia — Don’t Give It a Major Fall Haircut
Salvia can get pretty wild by the end of summer.
During the growing season, trimming and deadheading can encourage another flush of blooms.
Fall is different.
As the season gets later, I become much less aggressive with mine.
I’ll remove spent flowers or damaged growth if it bothers me, but I’m not interested in pushing a bunch of tender new growth right before colder weather eventually arrives.
Save the major cleanup for when the plant actually needs it.
7. Lantana — Wait Before Cutting It to the Ground
This is a big one for Southern gardeners.
Lantana can become enormous by the end of summer.
Mine can reach the point where I’m looking at it thinking:
You have got to go.
But I still don’t like cutting established lantana all the way to the ground too early.
The woody growth provides some protection around the crown of the plant, and there’s simply no benefit to rushing the process.
Once winter has done its damage and I can see what survived, I’ll deal with it.
For now, I may lightly tidy it, but the big pruning job can wait.
8. Ornamental Grasses — Leave Them Standing
If you grow ornamental grasses, fall is usually not the time I would cut them down.
I actually like the way ornamental grasses look during winter.
The seed heads and dried foliage give the landscape some height and movement when many other plants have disappeared.
They can also provide some winter habitat for insects and wildlife.
I leave mine standing through winter and cut the old growth back before new spring growth really gets going.
That’s much easier than trying to figure out what’s old and what’s new after fresh shoots start growing through the middle.
9. Irises — Clean Them, Don’t Scalp Them
Irises can start looking rough as the season progresses.
Brown tips? I’ll trim them.
Dead leaves? I’ll remove them.
Diseased foliage? Definitely remove it.
But healthy green leaves are another story.
Those leaves are still photosynthesizing and helping the rhizome store energy.
I don’t cut healthy iris foliage down just because I’m cleaning the flower bed.
There’s a difference between cleaning up a plant and cutting a plant back.
That’s an important distinction in fall gardening.
10. Azaleas — Put the Pruners Away
I have azaleas around my home, and fall is not when I start trying to reshape them.
Azaleas form their flower buds well ahead of spring blooming.
If you give an azalea a big haircut in fall, there’s a good chance you’re removing some of the flowers you’ve been waiting all winter to see.
If there’s a dead branch or something obviously damaged, that’s different.
Otherwise, I leave mine alone and enjoy the blooms next spring.
Then I can worry about shaping them after flowering.
11. Gardenias — Same Idea
Gardenias are another shrub I don’t start aggressively pruning in fall.
Gardenias bloom on growth that can be affected by poorly timed pruning, so I don’t see any reason to take that chance.
If my gardenia needs serious shaping, I would rather handle that after its main flowering period than start chopping on it heading into winter.
Fall is mostly maintenance.
Remove dead or damaged material.
Otherwise, let the plant be.
12. Mums — Don’t Throw Them Away Yet
A lot of people treat mums like disposable decorations.
Buy them in September.
Put them beside the front door.
Enjoy them for a few weeks.
Throw them away.
But garden mums can be perennials under the right conditions.
If I’ve got mums planted in the ground, I’m not immediately cutting them to the soil when the flowers turn brown.
I deadhead them and let the foliage continue doing its job.
Once the plant naturally goes dormant, I can decide how much cleanup it needs.
And if you’re planting mums in the landscape, the earlier you get them established, the better chance the roots have to settle in before winter.
What I DO Cut Back in Fall
Now, don’t take all of this to mean that I don’t clean my flower beds in fall.
I absolutely do.
I’m just more selective about it.
I remove:
- Diseased foliage
- Broken branches
- Rotten or mushy plant material
- Annuals that are completely finished
- Weeds before they produce even more weeds
- Dead flower stalks that aren’t providing any benefit
- Anything showing obvious pest or disease problems
That’s different from walking through the landscape and cutting every perennial and flowering shrub down simply because summer is over.
What I Do Instead of Cutting Everything Back
Fall is actually one of my favorite times to work in the yard here in the South.
It’s finally comfortable enough to stay outside without feeling like I’m going to melt.
Instead of spending all my time cutting plants back, I use fall to look at the bigger picture.
This is when I start noticing things like:
That plant has gotten way too big for that spot.
Or:
I really need something taller back there.
Or my personal favorite:
Why in the world did I plant that there?
Fall is a great time to move and divide certain perennials, plant new shrubs and trees, pull weeds, refresh mulch, edge beds, and start planning what you want the garden to look like next spring.
It’s also a great time to take pictures.
I do this because I will absolutely convince myself by February that I’ll remember where everything is planted.
I won’t.
The Rule I Use in My Own Yard
I’ve become much less aggressive about fall cleanup than I used to be.
My basic rule now is pretty simple:
If I don’t have a good reason to cut it, I leave it alone.
A plant being a little ugly isn’t always a good enough reason.
If the foliage is healthy and still helping the plant, I leave it.
If cutting it could remove next year’s flowers, I definitely leave it.
If seed heads are feeding birds or helping plants reseed, I may leave those too.
And if I’m simply not sure?
I wait.
You can always cut something tomorrow.
You can’t glue the branch back on after you realize you just removed next spring’s flowers.
One Last Walk Around the Garden
Before you do your big fall flower bed cleanup this year, take one slow walk around your yard before you get the pruning shears.
Look at each plant individually.
Ask yourself:
Is this actually dead or diseased—or does it just look tired because it survived another Southern summer?
There’s a big difference.
My hydrangeas, cannas, daylilies, azaleas, gardenias, irises and other perennials don’t all get treated the same way in fall.
Some get cleaned up.
Some get lightly trimmed.
And some get left completely alone.
That’s one of the biggest lessons gardening has taught me over the years.
Sometimes the best thing you can do for a plant is simply leave it alone until spring.
