Photo by Melody

PlantFiles: Rock's Peony, Tree Peony
Paeonia rockii 'Zi Ban Bai'

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Family: Paeoniaceae
Genus: Paeonia (pay-OHN-ee-uh) (Info)
Species: rockii (ROK-ee-eye) (Info)
Cultivar: Zi Ban Bai
Additional cultivar information: (Purple-white Speckle)

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Category:
Shrubs

Height:
6-8 ft. (1.8-2.4 m)

Spacing:
4-6 ft. (1.2-1.8 m)

Hardiness:
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
N/A

Bloom Color:
Purple
White/Near White

Bloom Time:
Late Spring/Early Summer

Foliage:
Deciduous

Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By grafting

Seed Collecting:
Unknown - Tell us

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to view:

By cuixx11
Thumbnail #1 of Paeonia rockii by cuixx11

By cafuller
Thumbnail #2 of Paeonia rockii by cafuller

By cafuller
Thumbnail #3 of Paeonia rockii by cafuller

By midwestfarmwife
Thumbnail #4 of Paeonia rockii by midwestfarmwife

By midwestfarmwife
Thumbnail #5 of Paeonia rockii by midwestfarmwife

By Terri1948
Thumbnail #6 of Paeonia rockii by Terri1948

By Terri1948
Thumbnail #7 of Paeonia rockii by Terri1948

Profile:

2 positives
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive midwestfarmwife On Sep 7, 2012, midwestfarmwife from Jamestown, OH wrote:

One of the more popular Rockii peony varieties which deserves a place in all flower gardens! Its exquisite white blooms with purple black base petals appear well before our herbaceous peonies. At maturity, Rockii peonies may reach a height of 5' with 100 or more huge, fragrant blooms! They are drought resistant and cold hardy, lasting for decades.

Positive cafuller On Jun 13, 2011, cafuller from Edmonton, AB (Zone 3b) wrote:

Planted a 3 year root in 2008 together with 2 other Rockiis, 2 yellow tree peonies and 2 yellow Itoh peonies. The Rockiis grew better than the other peonies and this is the first of the peonies to bloom. These are planted on the East side of my home by the street and get full sun until about 3 PM. I have not provided any winter protection. A -40* C winter killed quite a few of my unusual plants,Yuccas, Agaves, cacti and 1 of the Itoh peonies. The Rockii peonies were not affected.
The blooms stand out and are about 6" across. This is the nicest of the peonies that I grow.

Regional...

This plant has been said to grow in the following regions:

Jamestown, Ohio



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