Oakleaf Hydrangea

Hydrangea quercifolia

Hydrangeaceae · broadleaf deciduous shrub · introduced

Last updated

Oakleaf hydrangea (Hydrangea quercifolia, Hydrangeaceae) is a multi-stemmed, stoloniferous deciduous shrub native to Georgia, Florida, and Mississippi, reaching 4 to 6 feet tall (occasionally 8 feet). Oak-like, deeply lobed leaves (6 to 20 centimeters) turn red, orange, and purple in fall. White pyramidal flower panicles appear from May to July, and exfoliating cinnamon-orange bark provides winter interest.

Oakleaf hydrangea grows in full sun (needs some sun for bloom) on fertile, moist, well-drained soil, hardy in Zones 5a to 8b. It blooms on old wood; prune after flowering. Disease and pest profiles match the genus. Cultivars include 'Ruby Slippers' (compact, aging to ruby-red), 'Snow Queen' (heavy bloom), 'Pee Wee' (compact), and 'Munchkin.'

Quick Facts

Height
4-6 ft (to 8 ft)" # Source: OSU Landscape Plants (4-6 ft); MBG (4-6 ft, less frequently to 8 ft)
Spread
4-10 ft
Growth Rate
Medium # source: nc state extension plant toolbox. [verify] previous value "fast" may have been from ncsu enrichment field confusion; nc state profile page says "medium."
Light
Full Sun
Soil
Adaptable
Water
Moderate
Hardiness
Zone Zones 5a–8b
Bloom Time
May to July
Fall Color
Red, orange, bronze, maroon, purple
Origin
Southeastern United States
Watch for this season
Phytophthora Root RotModerate

Growing Season Stress Expression

Powdery MildewModerate

Spring Emergence / Primary Infection

Root weevilModerate

Adult Emergence & Foliar Feeding

Field Observations

Hydrangea quercifolia 'Ruby Slippers' - early bloom
Field Observation
Hydrangea quercifolia 'Ruby Slippers' · Oakleaf Hydrangea
early bloom
July 17, 2025 · Issaquah · 3,698 GDD₃₂ · BBCH 63
Hydrangea quercifolia - flower bud formation
Field Observation
Hydrangea quercifolia · Oakleaf Hydrangea
flower bud formation
June 14, 2023 · Issaquah · 2,540 GDD₃₂ · BBCH 55

Phenological Calendar

As of May 13, 2026, Puget Sound stations range from 1906.2 to 2098.2 GDD₃₂. Oakleaf Hydrangea typically reaches flower bud formation at 2540 GDD₃₂, predicted around May 31.

Regional Season Tracker

GDD₃₂ accumulation across 7 Puget Sound stations · as of May 13, 2026
Station GDD₃₂ Current Stage Next To Go
Issaquah / East King 2,098 Pre-season Flower bud formation 442
Kent / Auburn 2,089 Pre-season Flower bud formation 451
Seattle / UW 2,063 Pre-season Flower bud formation 477
Olympia / Tumwater 2,025 Pre-season Flower bud formation 515
Tacoma / Puyallup 1,993 Pre-season Flower bud formation 547
Bellingham / Whatcom 1,972 Pre-season Flower bud formation 568
Sequim / Rain Shadow 1,906 Pre-season Flower bud formation 634
Stage GDD32 Typical Window
Bud break BBCH 07 — Mar 1-Mar 30
Leaf emergence BBCH 11 — Mar 15-Apr 15
○ Flower bud formation BBCH 55 NEXT 2540 — est. May 31 (avg)
First bloom BBCH 61 2573 Jun 1-Jul 1 est. Jun 2 (avg)
Full bloom BBCH 65 — Jun 15-Jul 15
Bloom aging BBCH 67 — Jul 15-Sep 15
Fall color BBCH 93 — Oct 1-Nov 15
Dormancy BBCH 97 — Nov 15-Feb 28
Regional estimate
Range: 2128–2462 GDD₃₂ (6yr)

Sources: Field observation, Issaquah, WA, n=1 ; Master catalog (OSU), converted GDD50->GDD32 via Kent bloom-date mapping About GDD₃₂ →

Season tracker for Kent / Auburn as of May 13, 2026. Predicted dates use 16-day weather forecast through May 29, 2026, then climate normals.

Diseases: Regionally Documented (8)

Pests: Regionally Documented (1)

Cultivars (6)

'Snow Queen' Snow Queen (Flemygea)
Upright, sturdy stems hold panicles erect (no flopping). 4-6 ft tall x 6-8 ft wide. White flowers aging to pinkish-purple. Excellent fall color. One of the best all-around selections.
Good for Puget Sound landscapes; sturdy form handles rain-heavy panicles well.
'Alice'
One of the largest oakleaf selections. 10-15 ft tall and wide. Flower panicles 10-14 inches long, white aging to pink. Strong stems hold heavy panicles upright. Introduced by Michael Dirr / University of Georgia.
Needs room to develop its full form. Best for larger properties and as a specimen.
Hydrangea quercifolia 'Ruby Slippers' – early bloom
'Ruby Slippers'
Compact, 3-4 ft tall x 3-5 ft wide. Cross of 'Snow Queen' x 'Pee Wee'. Flowers white aging to ruby red (fastest color change of any cultivar). Mahogany-red fall foliage. USNA introduction.
Good compact selection for smaller PNW gardens.
'Pee Wee'
Compact form, 3-4 ft tall x 4-5 ft wide. Smaller panicles (4-5 in). Purple-red fall color.
'Munchkin'
Dwarf, compact, 3-4.5 ft tall. Dark green foliage with mahogany-red fall color. White 6.5 in panicles aging to pink. USNA introduction (2010). Seedling of 'Sikes Dwarf'.
'Snowflake' Snowflake (Brido)
Double flowers (multiple bracts give double appearance). 6-8 ft tall. Panicles 12-15 in, very showy but heavy panicles can cause stems to flop in rain.
Heavy panicles may flop in PNW rain; consider staking or a sheltered site.

Oakleaf hydrangea is native to the southeastern United States but performs exceptionally well in the Puget Sound lowlands, to the point where it quietly outperforms bigleaf hydrangea over a ten-year horizon on most local sites. Three traits drive that performance here. First, it blooms on old wood but the flower buds are meaningfully more cold-hardy than macrophylla, so late-frost bud loss is rare in Zone 8b. Second, it handles drier shade better than any other hydrangea species in cultivation, including under mature conifers once established, making it the default choice for dry-shade beds where smooth and bigleaf hydrangeas struggle. Third, it carries three seasons of interest through a single plant: large white panicles in early summer that age through pink to papery tan, burgundy-to-wine fall color that actually develops in our cool autumn nights, and cinnamon-brown exfoliating bark through winter. The 2021 heat dome did not scorch oakleaf the way it did macrophylla. Part sun with afternoon shade produces the best fall color; too much shade suppresses both flower production and autumn pigment. The main regional caveat is size: most selections run 6-8 ft, with 'Snow Queen' and 'Alice' larger still, and the compact forms like 'Pee Wee', 'Munchkin', and 'Ruby Slippers' are the right choice for smaller yards. This is the hydrangea to pick when the site is not obviously ideal for another species.

— Chris Welch, ISA Certified Arborist

Data Maturity
Structured Multiple sources. Expert review underway.