Prune These 10 Plants in October – Don’t Miss the Fall Trimming Window for a Stunning Comeback Next Year

One of the fun things about gardening is that there are no absolutes, including the optimal timing for pruning. Yes, you can prune a few plants in October in some regions, but mid-fall isn't the right time to give all garden plants their haircuts. For some, it can be decidedly dangerous.

Timing your fall pruning is more important than you might think. The last thing you want to do in October is chop off the buds for next season’s flowers – and this is entirely possible. Plants that set buds on old wood have set those buds by October, and every healthy branch you prune will contain those buds.

But that’s not all. Pruning plants stimulates growth. That means when you prune in October, you encourage new growth on those branches. And if you live in a region with cold winters, that tender new growth will die during the freezing weather. And don’t forget that autumn is often rainy, and fall pruning wounds can lead to fungal issues and bacterial infections. Finally, some plants are “bleeders,” oozing sap like there’s no tomorrow when pruned back in fall.

So, the question remains: which plants actually benefit from October pruning? Here is a short list of plants you should trim back this month, plus an overview of those you should absolutely not subject to mid-fall pruning. But let’s get started with some general fall-pruning tips.

Practical Fall-Pruning Tips

It’s important to get some ground rules before pruning anything at all in October, so let’s take a look at some good practices.

• Pruning time depends on region and weather. If you intend to get out the pruners in October, wait until the plants in your area enter complete winter dormancy, dropping all leaves. That may not happen until mid-month or later. If they aren’t dormant, new growth may appear during warm spells after freezing, growth that will die back overnight in the cold weather to come.
• Don’t prune in the rain or fog. Wait until a dry day comes round. Pruning during moist weather leads to fungal infections.
• Make sure your tools are clean and sharp. You may need to sterilize them during pruning if any of them are already infected. Dull cutting blades will not make clean snips. Bypass pruners are the best choice for most fall pruning jobs. The Felco F6 Bypass Pruning Shears, available on Amazon, were rated the best pruners in our testing. Keep them sharp with a Corona sharpener, also on Amazon.
• Keep the 3 Ds method of light pruning in mind. This lets you remove dead, damaged, or diseased wood without going overboard.
• Know your plants. Our list gives you a starting point for October pruning, but you may have other plants you can trim. Knowing your plants means checking which of them flower on new wood and which flower on old wood. Prune the latter group immediately after the flowers fade. New-wood bloomers will not lose flowers from an October trim.
• Think of the wildlife. Some plants produce seed pods that wildlife relies on for food or spent foliage that wildlife relies on for shelter. Leave these plants alone in fall. Wildlife makes the world go round.

Plants to Prune in October

Eenie-meeney-miney-mo is NOT the way to decide who to trim in October. And don’t even consider a whole-garden tidy-up. Any pruning should be targeted and carefully selected. Choose the landscape trees and shrubs that will benefit from pruning in October. Here are some specific plants to get you started.

1. Japanese Spirea

Japanese spirea is a landscape favorite that grows in a compact mound and grows fast. It is beloved for its long-lasting summer flowers and dramatic multi-season foliage color.

The best time for a heavy annual pruning is in early spring. This will push the plant to bloom intensively. October is also a good time for a light prune using the 3 Ds methodology. While you’re there with the pruners, take out any spent blooms that remain on the shrub.

2. Panicle and Smooth Hydrangeas

The timing of pruning hydrangeas depends on the type. Old wood bloomers, such as mophead and oakleaf hydrangeas, should never be pruned in fall because you'll remove next year's flower buds. Smooth and panicle hydrangeas, however, bloom on new spring growth, making them suitable for light pruning in October.

Wait until the shrub has dropped all its leaves and is fully dormant before reaching for the pruners. If either type puts on fresh growth after an early trim, that tender new growth is more likely to be damaged by freezing temperatures.

Save any hard pruning until late winter or early spring, but a simple 3 Ds prune in late October is worthwhile. Remove any dead, damaged, or diseased stems, then cut away spent flower heads – particularly on panicle hydrangeas, where the large blooms can become heavy with snow and ice and cause branches to snap. If needed, you can also shorten stems by up to one-third to tidy the shrub, leaving any major reshaping until spring.

3. Raspberries

These small berry plants should not be hard-pruned in October, but summer-bearing raspberries should get targeted sanitation cuts in fall. Prune out the old, brown, wood-stemmed floricanes that finished fruiting earlier in the summer. Now’s the perfect time to cut those brown stems to the ground. At the same time, you can tie in the fresh green canes.

For fall-bearing raspberries grown for two crops, prune off only the top portion of each cane that produced fruit in fall. Leave the lower part of the cane intact, as it will produce a second crop the following summer. Once that summer crop has finished, remove the entire cane to ground level.

You can also trim or prune blackberry and gooseberry in October, but only if they are summer-fruiting varieties. Be sure you know your type, and cut the year’s fruiting canes all the way down to the ground.

4. Blueberries

When pruning blueberries, stick to the 3 Ds pruning method in October. Inspect the shrub for any dead, diseased, or damaged canes and remove them with clean, sharp pruners. You can also clear away any weak, broken, or crossing shoots that are obviously causing problems, but save any major pruning until late winter or early spring while the plant is still dormant. At that point, you can thin out older canes to encourage vigorous new growth and better fruit production.

5. Roses

Pruning roses is usually a late-winter or early-spring job, but October is still a good time to give both bush and shrub roses a light trim. Reducing overly long or whippy canes by about one-third helps prevent strong winter winds from rocking the plant and loosening its roots. It also makes roses easier to protect with rose cones or other winter coverings. Save any hard pruning until late winter or early spring.

October is also the perfect time to tidy up around your roses. Rake up and discard any fallen leaves and prunings, as this debris can harbor black spot spores and other fungal diseases over winter.

One exception is Knock Out roses. Because they flower on new spring growth, you can prune Knock Out roses by around one-third in October without sacrificing next year's blooms. For other rose varieties, stick to light shaping now and leave more substantial pruning until the plants are dormant in late winter.

6. Southern Magnolia

For gardeners in the South, October is the ideal time to prune magnolia trees. Many southern magnolias continue flowering into fall, so avoid reaching for the pruners too soon, or you'll cut the display short.

After flowering has finished, remove any dead, damaged, or diseased branches and lightly shape the canopy if needed. It's best to avoid pruning southern magnolias in winter, as fresh cuts can cause the tree to bleed sap.

For trees, rather than risk balancing on a ladder, invest in a telescopic pole pruner, like Fiskars' 2-in-1 Extendable Tree Pruner and Pole Saw.

7. Gardenia

For gardeners in warmer regions, October is also a good time to prune gardenias. These fragrant shrubs typically bloom throughout summer and can continue flowering well into fall, so it's worth waiting until the display has finished before reaching for the pruners.

Once flowering is over, remove any leggy, dead, damaged, or unhealthy growth and lightly shape the shrub to maintain its form. Avoid heavy pruning, as this can reduce next season's blooms.

8. Fruit Trees

No, we are not telling you to do structural pruning on fruit trees in October. This should not happen until late winter. In October, though, it’s a good idea to remove dead and damaged wood, including broken limbs.

For pruning apple or pear trees, remove low branches that rub the ground in October. For plum or apricot trees, clip off any diseased wood or mummified fruit to prevent fungal spores from overwintering.

9. Most Herbaceous Perennials

Not every perennial should be cut back in the fall. In many cases, it's actually better to leave them standing through winter. Ornamental grasses add texture and interest to the garden during the colder months while also providing shelter for wildlife, and coneflower and black-eyed Susan seedheads offer an important food source for birds.

However, some herbaceous perennials are best cut back in October, particularly those prone to fungal diseases. Leaving infected foliage in place can allow problems to overwinter and reappear the following season. Iris, hollyhock, phlox, peonies, bee balm, hostas, and any plants showing signs of powdery mildew or other fungal diseases should all make your October pruning list.

10. Shrubs with Suckers

Most overgrown shrubs and trees are best left unpruned in late fall, as cutting them back can encourage tender new growth that's vulnerable to winter damage. One exception is suckers – the thin shoots that emerge from around a plant's base. Left unchecked, these can form dense colonies, spoil the plant's appearance, and divert energy away from the main shrub or tree.

Common landscape plants that produce troublesome suckers include dogwood, black locust, lilac, forsythia, sumac, witch hazel, and many fruit trees. During your October cleanup, cut suckers off as close to their point of origin as possible. You may need to scrape away a little soil to remove them cleanly from the base for the best results.

Fall Pruning Essentials

When to Stop Pruning in Fall

When the weather turns extreme, stop your fall pruning. This can mean rain, snow, hail, or high winds. It can also mean drought. These conditions put plants under stress so you should avoid adding pruning stress.

What Not to Prune in October

Generally, you should never prune plants in October if they bloom on old wood, including spring-blooming shrubs that form their flower buds on old wood (like lilacs, forsythia, and rhododendron).

Also avoid pruning plants that use their summer growth to survive winter weather, and plants that support wildlife. These include plants like black-eyed Susan, coneflower, ornamental grasses and Russian sage.

It’s also a good idea to avoid cutting trees like maples, birches, dogwood and elm are sap-heavy and they can leak excessive sap if cut in autumn.