Pruning in May: What to Cut Back and What to Let Bloom

May is a pivotal month in the garden—spring is hitting its stride, everything’s greening up fast, and if you’re not careful, your landscape can get away from you. But before you start swinging the pruning shears in every direction, it’s important to know: some plants thrive with a timely trim, while others should be left alone to strut their seasonal stuff.

Pruning in May is about balance. Done right, it can invigorate your plants, encourage new blooms, and keep your garden tidy and healthy. Done wrong, you might accidentally remove the very buds you were hoping to enjoy in a few weeks. Here’s your go-to guide on what to cut back—and what to let bloom.

🌿 Why Prune in May?

Late spring pruning has real benefits, especially for gardeners in USDA Zones 4 through 8. The ground is warm, plants are active, and you can clearly see which stems survived winter and which didn’t. May is also the last chance to get ahead of aggressive growers before summer’s heat kicks in.

Key goals for May pruning:

Remove winter-damaged branches
Shape and control growth
Encourage a second flush of blooms (on certain species)
Prevent disease by increasing airflow
Maintain size and structure

✂️ What to Cut Back in May

1. Spring-Flowering Shrubs (After Bloom)

Prune after flowers fade—these shrubs bloom on old wood (last year’s growth), so pruning too early can ruin your floral display.

Examples: Forsythia, lilac, azaleas, weigela, mock orange
How-To: Trim for shape, remove spent blooms, and cut out any dead or damaged wood. If it’s overgrown, cut back up to one-third of the oldest stems to ground level.

2. Evergreen Hedges

May is the perfect time to give evergreen shrubs their first haircut of the year.

Examples: Boxwood, yew, holly
How-To: Use clean, sharp shears to shape hedges and maintain size. Try not to cut back into old wood unless you’re doing rejuvenation pruning.

3. Fast-Growing Perennials

Many herbaceous perennials can benefit from a May trim to control size and encourage bushier growth.

Examples: Catmint (Nepeta), salvia, veronica, coreopsis
How-To: Shear by one-third to keep them tidy and promote longer bloom times.

4. Cool-Season Annuals

If your pansies, violas, or snapdragons are getting leggy, it’s time for a refresh.

How-To: Pinch or cut back by a few inches to promote branching and extend flowering.

5. Roses (Especially Repeat Bloomers)

If you didn’t do a hard prune in early spring, now’s the time to deadhead and shape.

How-To: Cut back faded blooms to the first five-leaflet leaf and remove any crossing branches or suckers from the base.

6. Suckers and Water Sprouts

These fast-growing, non-productive shoots steal energy from your main plants.

Examples: Found at the base of fruit trees, roses, and ornamental trees
How-To: Cut suckers at the base and water sprouts as close to the trunk or limb as possible.

🌸 What to Let Bloom (Don’t Prune These Yet!)

1. Summer-Blooming Shrubs (Not Yet!)

These bloom on new wood and are better pruned in late winter or very early spring.

Examples: Hydrangea paniculata (limelight types), rose-of-sharon, butterfly bush, beautyberry
Why Wait: Pruning now will cut off forming flower buds and reduce summer color.

2. Bulb Foliage

Spring bulbs like tulips and daffodils are done blooming, but don’t rush to trim back the leaves.

Why Wait: The foliage is feeding the bulb for next year’s bloom. Wait until it yellows naturally, then remove.

3. Flowering Trees

Dogwoods, crabapples, magnolias, and redbuds should be left alone until late summer or early fall.

Why Wait: Pruning now can stress the tree and attract disease-carrying insects like borers.

4. Late-Blooming Perennials

Let plants like black-eyed Susan, bee balm, phlox, and coneflowers continue growing until at least mid-summer.

Why Wait: Cutting now will delay blooming or reduce flower production.

🧤 Pro Tips for May Pruning

Use Sharp Tools: Clean cuts heal faster and reduce disease risk.
Disinfect Between Plants: Especially if you’re working with any diseased branches.
Step Back Often: Check shape and balance from a distance as you prune.
Compost Responsibly: Healthy trimmings can go in the compost bin; diseased or infested material should be bagged and trashed.

🌞 Final Thoughts

May pruning isn’t about cutting everything in sight—it’s about being strategic. Know your plant’s bloom cycle, growth habit, and seasonal needs. With a little attention and the right timing, your garden will look cleaner now and bloom even better later.

So grab your gloves, tune up your pruners, and head out with purpose—because a few well-placed cuts in May can make all the difference come summer.