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Climbing Hydrangea
Hydrangea petiolaris
Climbing Hydrangea blooms from June through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Climbing Hydrangea
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 38 ft tall and 6.5 ft wide at maturity, in roughly 5 years (not yet checked).
What was checked
Mature height and spread, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not, and each fact above says which. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Climbing Hydrangea
Plant Climbing Hydrangea in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 4 to 8, spring means March to May and fall means August or September. Once settled, it blooms from June to July.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Climbing Hydrangea get?
38 fttall5 ft 7 inan adult6.5 ftwideSee Climbing Hydrangea in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Climbing Hydrangea
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Climbing Hydrangea about 6.5 ft apart, center to center, so each plant has room to reach its full width.
Add Climbing Hydrangea to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Climbing Hydrangea's height, spread, hardiness zones, sun and trait tags were checked against 9 published sources on July 30, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- fast-growing-trees.comFast Growing Treesheight, spread, hardiness zones, sun, years to mature size and trait tags
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, years to mature size and trait tags
- NC State ExtensionPlant Toolboxheight, spread, hardiness zones, sun, years to mature size and trait tags
- The Morton Arboretumheight, hardiness zones, sun, years to mature size and trait tags
- The Tree Centerheight, spread, hardiness zones, sun and years to mature size
- Chicago Botanic GardenPlant Finderheight, hardiness zones, sun and years to mature size
- RHSRoyal Horticultural Societyheight, spread, sun and years to mature size
- Oregon State UniversityLandscape Plantsheight, hardiness zones and sun
- University of Arkansas ExtensionUniversity of Arkansas Division of Agriculture Cooperative Extension S...height and sun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Climbing Hydrangea
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note. A note reports what its source says; where that differs from a fact above, the fact above is this entry's stored value, and its mark says whether it has been checked.
Safety
Toxic to dogs, cats and horses; the leaves hold cyanogenic glycosides that release cyanide when chewed. Mostly causes vomiting and diarrhea; severe poisoning is rare. per ASPCA
Worth knowing
Famously slow to establish: expect 2 to 5 years of slow, shrubby growth with little bloom while the roots build, then it takes off and grows vigorously for decades. per NC State
Warm-end zone is disputed
Sources split on the warm end: some list zones 4 to 8, others cap it at 7. In hot, humid zone 8 it struggles, so treat 8 as optimistic. per NC State and Missouri Botanical Garden
When to prune
It blooms on old wood. To keep next year's flowers, prune right after flowering. Save a late-winter or early-spring cut for size control, since that removes set buds. per Iowa State and Morton
Needs a strong permanent support
It grows large and heavy at maturity, so give it a sturdy trellis, masonry wall, fence, or large tree. Install the support before the vine bulks up. per Missouri Botanical Garden and Chicago Botanic
Clings by aerial rootlets
It is self-clinging, gripping rough masonry, stone or tree bark directly with root-like holdfasts. It uses no tendrils, so it needs an adherent surface and early training. per NC State
Rare shade-tolerant flowering vine
It tolerates deep shade, so it flowers where most vines will not, on a north or east wall. Given full sun it blooms best but must be kept moist. per Missouri Botanical Garden
Feeds bees and butterflies
The lacecap flowers keep a center of fertile florets that bees and butterflies can use, so this vine offers real, if moderate, summer forage, unlike sterile mophead types. per Wisconsin
What pairs well with Climbing Hydrangea
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Azalea
Shares part shade and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.
Japanese Anemone
Shares part shade and moderate water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; a soft color beside the white.
Flowering Dogwood
Shares part shade and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; its white flowers settle the white.
Turtlehead
Takes part sun to part shade and moderate to high water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; a soft color beside the white.
Monkshood
Takes part sun to part shade and moderate water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; a soft color beside the white.
Camellia
Shares part shade and moderate water; blooms in midwinter, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter; they only overlap in zones 7 to 8.
Northern Sea Oats
Shares part shade and moderate water; overlaps, then carries the display into early fall; its seed heads stand through winter, for structure and the birds; a soft color beside the white.
Witch Hazel
Takes part sun to part shade and moderate water; blooms in late winter, before this one opens; shorter at 10 ft, an understory layer; both offer pollinator forage, in different months.
All 8 companion pairings for Climbing Hydrangea →
Try Climbing Hydrangea with its top companions in a garden →
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