Data specific to Peonies (Edit)
Originator/Registrant: Joseph Rock
Cultivar Group (Type): Suffruticosa Tree Peony
Flower Color: White
Flower color description: White petals with distinctive maroon red flares that create a star-like shape. Green carpels with yellow stigmas encased in a maroon sheath.
Flower size: Large to very large
Needs support: No

General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Mesic
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 9b
Plant Height: 6 feet
Plant Spread: 3-4 feet
Fruit: Dehiscent
Flowers: Showy
Fragrant
Flower Color: Bi-Color: white and pink
Bloom Size: 5"-6"
6"-12"
Flower Time: Spring
Late spring or early summer
Resistances: Deer Resistant
Rabbit Resistant

Image
Common names
  • Rock's Peony
  • Tree Peony
  • Peony

Photo Gallery
Location: St Louis
Date: 2020-04-26
Location: St Louis
Date: 2021-05-01
Location: St Louis
Date: 2013-05-09
Location:  Photo by George Chernilevsky taken in a garden in Ukraine
Date: 2011-05-22
Location: Peony Garden at Nichols Arboretum, Ann Arbor, Michigan
Date: 2014-05-29
P. rockii tree peony bloom.  The pattern of dark maroon flares in
Uploaded by robertduval14
Location: St Louis
Date: 2013-05-07
Location: Scott Arboretum, Swarthmore, Pennsylvania
Date: 2024-04-20
Location: Loki Schmidt Garten - Botanischer Garten der Universität Hamburg
Date: 2022-09-13
Location: Peony Garden at Nichols Arboretum, Ann Arbor, Michigan
Date: 2018-05-26
P. Rockii tree peony with its distinctive dark maroon flares at t
Location: Peony Garden at Nichols Arboretum, Ann Arbor, Michigan
Date: 2014-05-29
P. rockii tree peony - A mature multi-trunk specimen of unknown a
Location: Peony Garden at Nichols Arboretum, Ann Arbor, Michigan
Date: 2016-05-24
P. rockii tree peony - opening bud
Location: Botanischer Garten Berlin
Date: 2023-05-11
Location: Botanischer Garten Berlin
Location: Peony Garden at Nichols Arboretum, Ann Arbor, Michigan
Date: 2016-05-26
P. rockii tree peony - aging blooms.  The maroon flares are fadin
Location: Peony Garden at Nichols Arboretum, Ann Arbor, Michigan
Date: 2016-06-01
P. rockii tree peony - a mature plant with blooms dropping their
Location: St Louis
Date: 2014-05-03
Location: Botanischer Garten Berlin
Date: 2023-05-11
Uploaded by robertduval14

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