When should I cut back Annabelle hydrangeas?

In late winter or early spring, before new growth begins: Iowa State, Penn State, Clemson and Cornell Cooperative Extension all give that window. Ohio State also allows late fall. Minnesota says let a new plant grow a season or two first.

Can I cut Annabelle hydrangea to the ground?

Yes, once it is established. Smooth hydrangeas flower on new wood, so Iowa State and Penn State say they can be cut to the ground in late winter or early spring and still flower. Cornell Cooperative Extension in Orange County, New York, gives 6 to 12 inches above the ground.

Why do Annabelle hydrangeas flop over?

The flower heads are large and the stems are weak. NC State says the new shoots carry very large flower clusters, but after a heavy rain the stems bend and droop, and it describes Annabelle’s stems as weak and floppy, needing staking or support.

How do you prune Incrediball hydrangea?

Like Annabelle. Incrediball is a smooth hydrangea, Hydrangea arborescens, which Minnesota, Iowa State and Ohio State all list with Annabelle; it flowers on new wood, so cut it in late winter or early spring. We found no extension source with pruning advice for Incrediball alone.

Should I leave some old stems on a smooth hydrangea?

It is a choice. Ohio State says leaving last year’s stems unpruned gives more flowers, but smaller and less even ones, for a cottage-garden look. Minnesota says not pruning at all gives a larger shrub.

Guides

How to Prune Annabelle and Incrediball Hydrangeas

Annabelle and Incrediball are smooth hydrangeas. They flower on stems that grow this year, so they can be cut nearly to the ground in late winter and still flower in summer. The decisions are how low to cut, how many stems to keep, and how to keep big flowers from falling over.

Published October 31, 2026 · Cite this page

Annabelle and Incrediball are smooth hydrangeas

Both are cultivars of smooth hydrangea, Hydrangea arborescens, a shrub native to the eastern United States. Iowa State Extension says ‘Annabelle’, introduced in the early 1960s, is the most widely grown, and names Incrediball and Invincibelle Spirit among the newer ones; Minnesota lists Incrediball (‘Abetwo’) and Annabelle among its favorites. Clemson describes Annabelle’s flower heads as enormous 12-inch globes on a plant about 4 feet tall.

Smooth hydrangeas flower on new wood. Penn State Extension says they can be cut to the ground in late winter or very early spring and still give a decent show. NC State rates the species for zones 3a to 9b and says soil pH does not change its color. Iowa State says it grows 4 to 5 feet tall; Ohio State calls it ideal for zone 4.

When to prune Annabelle, by zone

Each zone’s median last spring freeze, the cold-year date NOAA says is passed in 9 years out of 10, and the median first fall freeze, from the median station. Beside them, what the extension services in states with ZIP codes in that zone say about pruning smooth hydrangeas.

Zone	Last spring freeze, median	Last spring freeze, cold year	First fall freeze, median	What sources for states in this zone say
Zone 3	May 19	June 1	September 22	University of Minnesota (Minnesota): let a new plant grow a season or two, then cut to the ground in spring, or not at all for a larger shrub
Zone 4	May 13	May 27	September 28	University of Minnesota (Minnesota): let a new plant grow a season or two, then cut to the ground in spring, or not at all for a larger shrub Iowa State University (Iowa): can be pruned back to the ground in late winter or early spring
Zone 5	May 6	May 20	October 5	University of Minnesota (Minnesota): let a new plant grow a season or two, then cut to the ground in spring, or not at all for a larger shrub Iowa State University (Iowa): can be pruned back to the ground in late winter or early spring Penn State (Pennsylvania): can be cut to the ground in late winter or very early spring and still flower
Zone 6	April 28	May 13	October 17	Iowa State University (Iowa): can be pruned back to the ground in late winter or early spring Penn State (Pennsylvania): can be cut to the ground in late winter or very early spring and still flower Ohio State University (Ohio): can be cut to less than 4 inches each year, in late fall or very early spring before new growth NC State Gardener Plant Toolbox (North Carolina): can be pruned back close to the ground in late winter; remove weak and damaged stems in early spring Cornell (Orange County, New York): late winter or early spring, before leaf-out; can be cut back to 6 to 12 inches above the ground
Zone 7	April 14	April 30	October 26	Penn State (Pennsylvania): can be cut to the ground in late winter or very early spring and still flower Ohio State University (Ohio): can be cut to less than 4 inches each year, in late fall or very early spring before new growth NC State Gardener Plant Toolbox (North Carolina): can be pruned back close to the ground in late winter; remove weak and damaged stems in early spring Cornell (Orange County, New York): late winter or early spring, before leaf-out; can be cut back to 6 to 12 inches above the ground
Zone 8	March 26	April 13	November 9	Penn State (Pennsylvania): can be cut to the ground in late winter or very early spring and still flower NC State Gardener Plant Toolbox (North Carolina): can be pruned back close to the ground in late winter; remove weak and damaged stems in early spring Clemson (South Carolina): just before new growth emerges in spring UGA (Fulton County, Georgia): late winter or early spring, before new growth emerges
Zone 9	February 25	March 21	December 1	NC State Gardener Plant Toolbox (North Carolina): can be pruned back close to the ground in late winter; remove weak and damaged stems in early spring Clemson (South Carolina): just before new growth emerges in spring
Zone 10	January 18	February 18	January 1	No source we read is written for a state in this zone

⚠️ A state spans several zones, and a zone spans many states. A rule shows in every zone its state has ZIP codes in, so read it with the state it was written for. The freeze dates are from the median NOAA station in each zone. None of these sources sets a pruning date by a freeze date: they time it by what the plant is doing, and the freeze dates show how far apart spring comes from one zone to the next.

The sources agree on the season, late winter or early spring before new growth, and differ only on fall: Ohio State allows late fall as well. The freeze dates show how far apart early spring comes from zone to zone.

How low to cut

The sources give a range, and each choice gives a different plant:

Cut	What follows	Source
To the ground	Still a decent show of flowers that summer	Penn State; Iowa State; Minnesota, once established
Less than 4 inches	More uniform flowers and a more formal look	Ohio State
6 to 12 inches	The cut it gives for late winter or early spring	Cornell Cooperative Extension, Orange County, New York
Less severely	A larger shrub	Cornell Cooperative Extension, Orange County
Not at all	A larger shrub (Minnesota); more but smaller, uneven flowers (Ohio State)	Minnesota; Ohio State

Step by step

Give a new plant time. Minnesota says let smooth hydrangeas grow a season or two before any hard pruning.
Prune in late winter or early spring. Clemson says just before new growth emerges.
Cut every stem to the height you chose. See the table above. Make each cut just above a healthy bud (UGA Extension, Fulton County).
Take out weak and damaged stems. NC State says do this in early spring.
Thin the new shoots for bigger flowers. Ohio State says selectively pruning the new growth in mid-spring, to reduce the number of stems, gives larger blooms, some more than 12 inches across.

Flopping stems

NC State says smooth hydrangea treated like a herbaceous perennial, cut back hard each year, sends up new shoots with very large flower clusters, but after a heavy rain those stems bend and droop. It describes Annabelle as having white flowers on weak, floppy stems that need staking or support.

The sources give two answers. Support the stems: NC State says stake them. Or leave more of last year’s wood: Ohio State says unpruned stems give more flowers, but smaller ones, and Minnesota and Cornell say lighter pruning gives a larger shrub.

Incrediball

Incrediball is a smooth hydrangea, so everything above applies: new wood, late winter or early spring, as low as you like once established. Minnesota, Iowa State and Ohio State list it alongside Annabelle, and NC State lists a pink form, Incrediball Blush. We found no extension source that gives Incrediball pruning advice of its own or compares its stems with Annabelle’s, so this page does not claim a difference.

The rest of the year

NC State says smooth hydrangea needs neutral to acidic, well-drained soil in partial shade and tolerates full sun only with steady moisture. Ohio State says most years it flowers at the end of May in southern Ohio and early June in northern Ohio, the flowers fade to lime green later in summer if there is enough water, and the dried heads stay on part of the winter. Ohio State also says it divides easily in fall. NC State says it is the host plant of the hydrangea sphinx moth.

If you leave the stems over winter and cut in spring, that is not a winter-protection job: the buds that matter grow next spring. Smooth hydrangea is one of the plants you can cut back in late winter like a perennial.

Supplies

Supplies the sources mention

Each link opens an Amazon search for a plain kind of product, not one we picked. We have not tested these, and we do not rank them.

As an Amazon Associate I earn from qualifying purchases. It costs you nothing extra and changes nothing on this page: the dates are NOAA’s and the advice is the extension services’. Affiliate disclosure

Bypass hand prunersOhio State cuts smooth hydrangea to less than 4 inches each year and thins the new shoots in mid-spring, both close, clean cuts.
Plant support ringsNC State’s plant toolbox says Annabelle has weak, floppy stems and needs staking or support.

Your ZIP code

Your ZIP, your answer

Enter your ZIP code to see your USDA zone, each zone’s freeze dates and what the sources there say about pruning smooth hydrangeas, read from the table on this page, and the freeze dates of the NOAA station nearest you.

This box needs JavaScript to answer on the page. Without it, the button opens the ZIP code zone finder; your zone’s row is in the table on this page.

Your answer appears here.

Full details for any ZIP code: ZIP code zone finder.

Common mistakes

Hard-pruning a young plant. Minnesota says wait a season or two.
Pruning after growth starts. Clemson times it just before new growth emerges.
Expecting pink from pH. NC State says smooth hydrangea color does not change with soil pH; the pink ones are pink cultivars.
Leaving weak and damaged stems. NC State says remove them in early spring.

In the South

Clemson, writing for South Carolina, prunes smooth hydrangeas just before new growth emerges in spring, and UGA Extension in Fulton County, Georgia, gives late winter or early spring. NC State rates the species to zone 9b. We found no Texas A&M or LSU source on smooth hydrangeas, so advice for Texas and Louisiana here is limited; ask your county extension office.

Every pruning guide

Questions

When should I cut back Annabelle hydrangeas?: In late winter or early spring, before new growth begins: Iowa State, Penn State, Clemson and Cornell Cooperative Extension all give that window. Ohio State also allows late fall. Minnesota says let a new plant grow a season or two first.
Can I cut Annabelle hydrangea to the ground?: Yes, once it is established. Smooth hydrangeas flower on new wood, so Iowa State and Penn State say they can be cut to the ground in late winter or early spring and still flower. Cornell Cooperative Extension in Orange County, New York, gives 6 to 12 inches above the ground.
Why do Annabelle hydrangeas flop over?: The flower heads are large and the stems are weak. NC State says the new shoots carry very large flower clusters, but after a heavy rain the stems bend and droop, and it describes Annabelle’s stems as weak and floppy, needing staking or support.
How do you prune Incrediball hydrangea?: Like Annabelle. Incrediball is a smooth hydrangea, Hydrangea arborescens, which Minnesota, Iowa State and Ohio State all list with Annabelle; it flowers on new wood, so cut it in late winter or early spring. We found no extension source with pruning advice for Incrediball alone.
Should I leave some old stems on a smooth hydrangea?: It is a choice. Ohio State says leaving last year’s stems unpruned gives more flowers, but smaller and less even ones, for a cottage-garden look. Minnesota says not pruning at all gives a larger shrub.

Sources

Dates on this page are computed when the site is built from NOAA's 1991–2020 Climate Normals (first fall freeze at 32 °F, for every station the ZIP codes in each zone cite). Zones are the USDA Plant Hardiness Zone Map, 2023. Every rule — how long before or after a freeze to plant, how deep, how much — is quoted from the extension publications below, each of which writes for its own area.

University of Minnesota Extension, Pruning hydrangeas for best bloom . Written for: Minnesota (USDA zones 3a–5a).
Penn State Extension, When to Prune Which Hydrangea Species , by Sandy Feather (Updated December 16, 2025). Written for: Pennsylvania (USDA zones 5b–8a).
Ohio State University Extension, Selecting Hydrangeas for the Home Landscape (HYG-1263) , by Eric Barrett (July 20, 2018). Written for: Ohio (USDA zones 6a–7a).
Iowa State University Extension and Outreach, Pruning Hydrangeas , by Richard Jauron and Aaron Steil (Last reviewed June 2022). Written for: Iowa (USDA zones 4b–6a).
NC State Extension Gardener Plant Toolbox, Hydrangea arborescens (smooth hydrangea) . Written for: North Carolina (USDA zones 6b–9a).
Clemson Cooperative Extension, Home & Garden Information Center, Pruning Hydrangeas , by Andrew “Drew” Jeffers (March 5, 2020). Written for: South Carolina (USDA zones 8a–9b).
Clemson Cooperative Extension, Home & Garden Information Center, Hydrangea (HGIC 1067) , by Marjan Kluepfel and Robert F. Polomski (Updated October 31, 2025). Written for: South Carolina (USDA zones 8a–9b).
UGA Extension, Fulton County, The Comprehensive Guide to Pruning Hydrangeas , by John Fox, Fulton County Master Gardener Extension Volunteer (May 30, 2025). Written for: Fulton County, Georgia (USDA zones 8a–8b).
Cornell Cooperative Extension, Orange County, Hydrangeas: Types and How to Prune . Written for: Orange County, New York (USDA zones 6b–7a).

Nothing here replaces your own state's cooperative extension service, which knows your county. Where this site's numbers come from.

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