General Plant Information (Edit)
Plant Habit: Shrub
Sun Requirements: Full Sun to Partial Shade
Partial or Dappled Shade
Water Preferences: Wet Mesic
Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Moderately alkaline (7.9 – 8.4)
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 9b
Plant Height: 3 to 6 feet
Plant Spread: 3 to 6 feet, often suckers to wider spread
Leaves: Deciduous
Fruit: Dehiscent
Other: brown capsules in dry brown flower clusters
Fruiting Time: Late summer or early fall
Fall
Late fall or early winter
Flowers: Showy
Blooms on new wood
Flower Color: White
Bloom Size: 5"-6"
Flower Time: Summer
Underground structures: Rhizome
Uses: Erosion control
Will Naturalize
Wildlife Attractant: Bees
Resistances: Flood Resistant
Propagation: Seeds: Stratify seeds: cold moist for 1 to 2 months hastens and unifies germination
Sow in situ
Propagation: Other methods: Cuttings: Stem
Stolons and runners
Pollinators: Bees
Various insects
Miscellaneous: Tolerates poor soil
Monoecious

Image
Common names
  • Smooth Hydrangea
  • Wild hydrangea
  • Sevenbark
  • Seven Barks
  • Hydrangea

Photo Gallery
Location: Reading, Pennsylvania
Date: 2023-11-23
the first wild specimen I've ever seen, close to a hiking trail
Location: Mount Cuba Center, Hockessin, Delaware
Date: 2018-06-29
shrub in bloom in native, natural landscape
Location: Wayne, Pennsylvania
Date: 2023-07-02
shrub getting towards being full-grown in bloom
Location: Longwood Gardens in southeast PA
Date: 2018-07-10
foliage and flower clusters
Location: Phoenixville, Pennsylvania
Date: 2019-01-31
shrub in winter
Location: East Tennessee
Date: 2014-05-28
Location: Phoenixville, Pennsylvania
Date: 2019-01-31
winter flower clusters, mostly fertile florets
Location: Mount Cuba Center, Hockessin, Delaware
Date: 2018-06-29
full-grown shrub in bloom
Location: Longwood Gardens in southeast PA
Date: 2018-07-10
full-grown specimen in woods in bloom
Location: Downingtown, Pennsylvania
Date: 2020-07-17
fertile florets in center are green after bloom
Location: Downingtown, Pennsylvania
Date: 2020-07-02
3 tiny bees or bee-like insects on fertile florets
Location: Mount Cuba Center, Hockessin, Delaware
Date: 2018-06-29
shrub in white bloom in native, natural landscape
Location: Downingtown, Pennsylvania
Date: 2018-07-03
a bee on my young, newly planted shrub's flower cluster
Location: Jenkins Arboretum in Berwyn, PA
Date: 2012-06-10
flower clusters with lots of fertile florets in centers
Location: Phoenixville, Pennsylvania
Date: 2017-06-29
close-up of flower clusters with many fertile florets
Location: Downingtown, Pennsylvania
Date: 2020-10-04
tiny brown capsules on flat inflorescences
Location: East Tennessee
Date: 2014-05-28
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2014-07-06
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2014-07-06
Location: My Garden
Date: 2013-08-10
Location: Downingtown, Pennsylvania
Date: 2020-07-17
fertile florets in center are green after bloom
Location: Hawk Mountain Sanctuary, Pennsylvania
Date: 2019-10-24
getting some yellowish fall color
Location: Hawk Mountain Sanctuary, Pennsylvania
Date: 2019-10-24
some yellowish fall color
Location: Stroud Land Preserve in southeast PA
Date: 2013-06-28
shrub at headquarters
Location: Jenkins Arboretum in Berwyn, PA
Date: 2012-06-10
a mass of shrubs along walkway
Location: Phoenixville, Pennsylvania
Date: 2017-06-29
full-grown shrub in bloom
Location: Phoenixville, Pennsylvania
Date: 2017-06-29
another shot of full-grown shrub in bloom
Location: Phoenixville, Pennsylvania
Date: 2017-06-29
close-up of flower clusters and foliage
Location: Jenkins Arboretum in Berwyn, PA
Date: 2011-12-18
the bare mass of shrubs in winter
Location: Jenkins Arboretum in Berwyn, PA
Date: 2011-12-18
a dry flower cluster in winter
Location: East Tennessee
Date: 2014-05-28
Location: Downingtown, Pennsylvania
Date: 2020-06-30
my maturing specimen in bloom in part-shade
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2014-07-06
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2014-07-06
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2014-07-06
This plant is tagged in:
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Comments:
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Dec 21, 2017 7:51 PM concerning plant:
    So far, I have not seen this mother species of the Smooth Hydrangea in the wild. I have seen some planted in landscapes and arboretums. This Wild Smooth Hydrangea has what is termed as a "lacecap" type of hydrangea flower cluster. Most of the flower cluster is composed of the tiny white fertile florets starting in the center of the cluster, and then there is a ring of the larger, showy infertile florets on the outside of the cluster. (What I really find in landscapes are: the old-fashioned 'Grandiflora' that is 4 to 6 feet high with rounded flower clusters about 6 to 8 inches across with all sterile florets, and the 'Annabelle' that is more compact about 3 to 4 feet high with larger, rounded, all sterile flower clusters about 12 inches across.) I prefer the more gentle beauty of the mother species which is useful to many pollinating insects as bees and butterflies, since it produces pollen, and also seed. In fact, I've seen this species just crawling with lots of happy bumblebees and small bees.

    The species is native from southern New York down to northwest Florida over to eastern Oklahoma up through central Illinois to around Starved Rock State Park, in deep rich upland forests to sheltered mesic coves to floodplain forests to the banks of watercourses. It does not like dry soil or drought, so be prepared to give it some water in summer. It bears its flowers on new wood so that one can prune it down, even very low or to the ground, in early spring. It is one of those shrubs that is barely woody, almost a perennial. It does ground sucker some. Only native plant nurseries sell this straight species.

    A number of new cultivars have been developed that have the "lacecap" type of flower clusters that are larger and showier than the mother species. Some more cultivars of the round "hortensia" flower cluster also have been developed along with a few pink flowered hortensia cultivars also. The hortensia (mophead) flower clusters normally have few or none of the tiny fertile florets that are loved by pollinating insects. (There is a possibility that my photos taken in Phoenixville, PA, may be the cultivar of 'White Dome' in that the flower clusters are a little more domed and less flat than most.)

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