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Climbing Hydrangea
Hydrangea petiolaris
Climbing Hydrangea blooms from June through July.
Mature size, 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.
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 26 ft tall and 6.6 ft wide at maturity, in roughly 5 years.
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. For the middle of its hardy zones 4 to 8 range, 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: for the middle of its range, start with zone 6 in March.
Good to know about Climbing Hydrangea
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
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; evergreen, so the bed keeps its shape through winter; low at 3.9 ft, to carpet the ground beneath it.
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 orange.
Solomon's Seal
Shares part shade and moderate water; blooms in late spring, before this one opens; both offer pollinator forage, in different months; a soft color beside the orange.
Monkshood
Takes part sun to part shade and moderate water; blooms in late summer as this one finishes; low at 3.9 ft, to carpet the ground beneath it; both offer pollinator forage, in different months.
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; low at 3.3 ft, to carpet the ground beneath it.
Witch Hazel
Takes part sun to part shade and moderate water; blooms in late winter, before this one opens; shorter at 9.8 ft, an understory layer; both offer pollinator forage, in different months.
Summersweet
Shares part shade and moderate to high water; overlaps, then carries the display into late summer; shorter at 5.9 ft, an understory layer; both offer pollinator forage.
Serviceberry
Takes part sun to 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 orange.
Try Climbing Hydrangea with its top companions in a garden →
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