Fall garden cleanup used to mean cutting everything to the ground and raking every leaf. Many gardeners now know that approach does more harm than good. Some plants should be cut back in fall, but many look better, protect themselves better, and feed more birds and pollinators if you leave them standing until spring.

This guide covers what to cut back, what to leave, which shrubs you should never prune in fall, and what to do with all those leaves. It’s written for Massachusetts gardens, but most of it applies anywhere in New England.

In this guide

1. What should you cut back in fall?
2. Perennials to cut back
3. Plants to leave standing until spring
4. Shrubs you should not prune in fall
5. What to do with fallen leaves
6. Other fall garden tasks worth doing
7. Use fall to see your yard clearly
8. Frequently asked questions

What should you cut back in fall?

In fall, cut back perennials that are diseased, pest-prone, or turn to mush after frost, such as peonies, hostas, and bearded iris. Leave healthy plants with sturdy stems and seed heads, like coneflowers, ornamental grasses, and sedum, standing until spring. They add winter interest, feed birds, and shelter beneficial insects.

A simple rule: if a plant is sick or slimy, cut it. If it’s healthy and still has shape, leave it.

Perennials to cut back

These plants are better off cut back after a hard frost, usually to a few inches above the ground:

• Peonies. Peony foliage can carry fungal disease over the winter. Cut stems to the ground and throw the foliage away rather than composting it.
• Bearded iris. Removing old leaves in fall helps reduce iris borer, a pest that lays its eggs on the foliage.
• Hostas. After frost, hosta leaves collapse into a slimy mat that shelters slugs. Clearing them makes spring cleanup easier.
• Bee balm and garden phlox affected by powdery mildew. If the leaves turned gray and dusty this summer, cut the plants back and dispose of the debris to reduce next year’s problem.
• Daylilies. These are optional. The foliage turns mushy after frost, and many gardeners prefer to tidy it now.
• Annuals and vegetable plants. Pull spent annuals and clear out vegetable beds, especially any plants that had disease.

Use clean, sharp pruners, and wipe the blades between plants if you’re cutting anything that looked diseased.

Plants to leave standing until spring

These plants earn their place through the winter. Cut them back in early spring instead, before new growth starts:

• Ornamental grasses. Grasses like switchgrass and little bluestem look striking in snow, and their foliage helps protect the plant’s crown through winter.
• Coneflowers and black-eyed Susans. Their seed heads feed goldfinches and other birds well into winter.
• Sedum. Tall sedums hold their flower heads all winter and look beautiful with a cap of snow.
• Asters and goldenrod. Both offer late food for pollinators and seeds for birds.
• Plants with hollow or pithy stems. Many native bees spend the winter inside old stems. If you want to tidy up, cut stems back to about 12 to 18 inches in spring and leave the stubble, which new bees can nest in.
• Marginally hardy perennials. Plants that sometimes struggle through a cold winter often survive better with their old growth left in place to protect the crown.

Leaving plants standing isn’t laziness. A garden with structure through December, January, and February is a better garden. Seed heads, grasses, and stems give a yard shape and movement during the months when nothing is blooming.

Shrubs you should not prune in fall

Fall is one of the worst times to prune most shrubs. Pruning can encourage tender new growth that winter cold will damage, and for many shrubs, it cuts off next year’s flowers.

• Spring-flowering shrubs. Lilac, forsythia, rhododendron, azalea, and viburnum have already set next spring’s flower buds. Prune them right after they bloom in spring.
• Bigleaf hydrangeas. These blue and pink mophead hydrangeas bloom on last year’s stems. Fall pruning removes next summer’s flowers. Leave them alone, or just remove spent blooms.
• Panicle and smooth hydrangeas. These bloom on new growth, so they can be pruned, but late winter or early spring is the better time.
• Roses. Save major pruning for spring, once you can see which canes made it through the winter.
• Butterfly bush and similar shrubs. Cut these back in spring, not fall.

The exception is anything dead, broken, or diseased. Remove damaged branches any time you see them, especially before winter storms add snow and ice.

What to do with fallen leaves

Leaves are free mulch and fertilizer, but where they land matters.

• On the lawn: Don’t leave a thick layer of whole leaves on grass all winter. A heavy, wet mat can smother the lawn. Either run over them with a mulching mower so the shredded pieces settle into the grass, or rake them off.
• In garden beds: A layer of leaves around perennials and shrubs insulates roots, holds moisture, and breaks down into rich soil. Shredded leaves work best, because whole leaves can mat down and block water and air.
• For wildlife: Many butterflies, moths, and other beneficial insects spend the winter in leaf litter. Leaving leaves under shrubs and along the edges of the yard gives them somewhere to survive.
• In the compost pile: Extra leaves are an excellent “brown” ingredient for compost.

Keep leaves and mulch a few inches away from tree trunks and the base of shrubs. Mulch piled against bark traps moisture and invites rot and rodents.

Other fall garden tasks worth doing

A little work now pays off in spring:

• Water evergreens deeply before the ground freezes. Rhododendrons, boxwood, and other evergreens lose moisture through their leaves all winter. A good soaking in late fall helps prevent winter burn.
• Plant spring bulbs. Tulips, daffodils, and crocus can go in any time before the ground freezes.
• Mulch new plantings after the ground freezes. A layer of mulch on top of frozen soil helps prevent the freeze-thaw cycles that can push young plants out of the ground.
• Shut down irrigation. Drain hoses and have sprinkler systems blown out before the first hard freeze to prevent cracked pipes.
• Clean and sharpen your tools. Put them away clean, and they’ll be ready the first warm day.
• Test your soil. Fall is a good time for a soil test from the UMass Soil and Plant Nutrient Testing Laboratory. You’ll have results in time to plan spring improvements.
• Look for invasive shrubs. Burning bush turns bright red in fall, which makes it easy to spot. It’s on the Massachusetts Prohibited Plant List because it spreads into woodlands. Fall is a good time to mark it for removal and plan a native replacement.

Use fall to see your yard clearly

As a landscape designer, I think fall cleanup is the best time of year to take an honest look at your yard. With the leaves dropping and the garden thinning out, the bones of your property are easy to see.

While you’re out with the rake, notice:

• Where the yard looks empty. If your garden disappears completely after October, it may need more evergreens, grasses, or shrubs with interesting bark or berries.
• Where you lose privacy. Bare trees reveal views of the street and neighbors that summer leaves hid.
• Where water and leaves collect. Low spots that stay soggy point to drainage problems worth solving.
• What struggled this year. Plants that sulked all summer may be in the wrong spot for their light or soil.
• Where you actually spent time outside. That tells you more about what your yard needs than any magazine photo.

Write these down or take photos. They’re exactly what a designer needs to plan a better yard, and winter is the best time to do that planning. Here’s why winter is the best time to hire a landscape designer.

Frequently asked questions

When should I do fall garden cleanup in Massachusetts?

Most fall garden cleanup is best done after the first hard frost, usually in late October or November in Massachusetts. Frost signals plants to go dormant, and cutting back earlier can encourage tender new growth. Leaf cleanup on lawns can continue until the leaves stop falling.

Is it better to leave leaves on garden beds?

Yes, in most cases. A layer of leaves in garden beds insulates plant roots, holds moisture, and breaks down into organic matter. It also shelters overwintering insects. Shredded leaves work better than whole ones, which can mat down. Keep thick layers of leaves off the lawn.

Should I cut back ornamental grasses in fall?

No. Leave ornamental grasses standing through winter for structure and to protect the plant’s crown. Cut them back in late winter or early spring, before new green shoots appear. Tying the clump with twine first makes cutting and cleanup much easier.

Can I prune hydrangeas in fall?

It depends on the type. Don’t prune bigleaf hydrangeas in fall, because they bloom on old wood and you’ll cut off next summer’s flowers. Panicle and smooth hydrangeas bloom on new wood and can be pruned, but late winter or early spring is a better time.

Turn this fall’s notes into next spring’s garden

If your fall cleanup showed you a yard that’s bare all winter, short on privacy, or full of plants that don’t thrive, that’s worth fixing with a plan, not one plant at a time.

Land Design Associates works with homeowners in Walpole and the surrounding towns. Book a winter design consultation, bring your notes and photos, and we’ll help you plan a yard that looks good in every season.

Contact us today Contact Us | Boston Landscaping | Land Design Associates | 781.868.4392 to schedule a pre-season site walk and lock in your spot for the 2026–2027 winter.