The Main Plant entry for Hydrangeas (Hydrangea)

This database entry exists to show plant data and photos that apply generically to all Hydrangeas.

General Plant Information (Edit)
Plant Habit: Shrub
Sun Requirements: Full Sun to Partial Shade
Soil pH Preferences: Neutral (6.6 – 7.3)
Leaves: Deciduous
Fruit: Dehiscent
Flowers: Showy

Common names
  • Hydrangea

Photo Gallery
Location: KALAMA WA
Location: KALAMA WA
Location: In my garden in Kalama, Wa.
Date: 2009-07-12
Location: In my garden in Kalama, Wa.
Date: Mid Summer
Location: In my garden in Kalama, Wa.
Date: Mid Summer
Location: In my garden in Kalama, Wa.
Date: 2009-09-05
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  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Dec 14, 2018 3:14 PM concerning plant:
    According to a few different botanical sources, there are about 23 to 70 to 100 species of Hydrangeas native to the Americas, only a few, and most native to southern & eastern Asia. Some botanists used to consider them as part of the Saxifrage Family that includes Alumroot & Coralbells as members, but seems to not be best. There is a Hydrangea Family in the Dogwood Order that contains about 17 genera with about 190 species that includes Deutzia, Philadelphus (Mockoranges), Decumaria (Climbing-Hydrangea), Schizophragma (Hydrangea-vines), and others. Hydrangeas usually are soft-wooded shrubs, but a few are small trees or lianas (woody vines), and most are deciduous, but some are evergreen in tropical sites. The word "hydrangea" was made up by botanists from two Greek words meaning "water vessel" that refers to the shape of the cup-shaped seed capsules. The flower clusters are panicles or corymbs composed of tiny fertile flowers that bear the brown, dry fruit and the sterile flowers with 4 petal-like sepals that are conspicuous. Some of the several species that are used in gardening-landscaping have mutated cultivars where there are only sterile flowers in the clusters that make up a showier display. Such all-sterile flower heads do not benefit pollinating insects. Most species bear only white flowers, but a few bear flowers that colour as blue to purple to pink to rose. The most well-known species is the Bigleaf Hydrangea (H. macrophylla) from Japan that has had so many hundreds of different cultivars developed with all colours available and is used a lot as a florist flower in a pot grown in greenhouses, besides gardens. (The Mountain Hydrangea of Japan & Korea (H. serrata) seems to be a subspecies of this that has smaller leaves.) Many people call this Japanese species as "the Hydrangea" in the South and Mid-Atlantic Regions of the USA, but farther north where it is not cold hardy, "the Hydrangea" is a cultivar of the white-blooming Wild Smooth Hydrangea of eastern North America (H. arborescens). There are three other species of hydrangeas sold by nurseries as the Oakleaf Hydrangea, and the Panicled Hydrangea (H. paniculata) and the Climbing Hydrangea (H. petiolaris) from east Asia. The buds and leaves of Hydrangeas are opposite. There is a Peruvian Hydrangea native from Costa Rica into the Andes that can be a shrub or a vine.
  • Posted by Marilyn (Kentucky - Zone 6a) on May 20, 2013 7:47 PM concerning plant:
    "Hydrangeas are popular ornamental plants, grown for their large flowerheads, with Hydrangea macrophylla being by far the most widely grown with over 600 named cultivars, many selected to have only large sterile flowers in the flowerheads. Some are best pruned on an annual basis when the new leaf buds begin to appear. If not pruned regularly, the bush will become very 'leggy', growing upwards until the weight of the stems is greater than their strength, at which point the stems will sag down to the ground and possibly break. Other species only flower on 'old wood'. Thus new wood resulting from pruning will not produce flowers until the following season.

    Hydrangeas are moderately toxic if eaten, with all parts of the plant containing cyanogenic glycosides. Hydrangea paniculata is reportedly sometimes smoked as an intoxicant, despite the danger of illness and/or death due to the cyanide."

    Taken from wikipedia's page at:
Plant Events from our members
piksihk On May 20, 2022 Plant Ended (Removed, Died, Discarded, etc)
The one that was in back yard WG in a pot
piksihk On August 12, 2018 Cuttings stuck
Pink from back
piksihk On June 17, 2017 Plant Ended (Removed, Died, Discarded, etc)
Plant Delight pot
piksihk On April 22, 2017 Transplanted
From back WG to frt bed; this is the 2nd one
piksihk On October 8, 2016 Miscellaneous Event
Two rooting - pink
UncleWill On October 23, 2018 Miscellaneous Event
No blooms this year. Early warm spell exposed buds to killing frost.
WebTucker On May 18, 2022 Bloomed
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
Oh my! by wcgypsy May 21, 2016 11:49 AM 8
Hydrangeas by valleylynn Dec 16, 2017 10:09 AM 4

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