General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Partial or Dappled Shade
Water Preferences: Mesic
Soil pH Preferences: Neutral (6.6 – 7.3)
Plant Height: 3 - 5 feet
Plant Spread: 3 - 4 feet
Leaves: Good fall color
Deciduous
Fruit: Dehiscent
Flowers: Showy
Blooms on old wood
Blooms on new wood
Other: Rebloomer
Flower Color: Multi-Color: Pink to Blue to Violet
Other: Color depends on soil PH.
Flower Time: Late spring or early summer
Summer
Late summer or early fall
Wildlife Attractant: Bees
Propagation: Other methods: Cuttings: Stem
Cuttings: Cane
Division
Pollinators: Bees
Miscellaneous: Patent/Plant Breeders' Rights: PP20,176
Parentage: Penny Mac x Lady in Red
Child plants: one child plant

Image
Alternative cultivar names:
  • 'Piihm-1'
  • 'Piihm-I'

Trade name information:
Series: Endless Summer®
Trade Name: Twist-n-Shout®
Cultivar name: 'Piihm-1'
Common names
  • Lacecap Hydrangea
  • Hydrangea
  • Bigleaf Hydrangea

Photo Gallery
Location: Thomasville, GA USA
Date: 2019-05-18
Location: My backyard in Salisbury, MD
Date: 2017-06-18
Endless Summer Twist-n-Shout Lacecap Hydrangea
Location: Apple Valley MN
Date: 2017-12-18
Location: Feeringbury Manor, Essex, UK
Date: 2022-07-29
Location: Western Washington
Uploaded by Lynnez

Date: 2013-09-19
Location: KALAMA WA
  • Uploaded by Joy
Location: Western Washington
Date: 2014-10-08
fall rebloom
Location: My Northeastern Indiana Gardens - Zone 5
Date: 2010-06-26
Blooms on Old and New Wood
Location: Apple Valley MN
Date: 2016-08-10
Twist-n-Shout

Date: 2013-10-16
Location: Apple Valley MN
Date: 2019-10-28
Twist n Shout glows in the fall
Location: KALAMA WA
  • Uploaded by Joy

Date: 2018-09-27
Location: Kalama, Wa.
  • Uploaded by Joy
Location: My garden in Aurora, Ontario zone 5b
Date: 2015-08-09
Location: Apple Valley MN
Date: 2016-08-10
Twist-n-Shout
Location: Fairfax, VA
Date: 2022-04-01
Public landscaping
Location: Botanical Gardens of the State of Georgia...Athens, Ga
Date: 2019-06-09
Lacecap Hydrangea 020

Date: 2014-08-04
Location: Maryland
Date: 2015-06-08
Location: Wood County.  TX
Date: 2022-06-01
Location: Botanical Gardens of the State of Georgia...Athens, Ga
Date: 2019-05-24
Hydrangea macrophylla - Twist And Shout 001

Date: 2015-09-08
Location: Eagle Bay, New York
Date: 2017-07-15
Lacecap Hydrangea (Hydrangea macrophylla Endless Summer® Twist-n

Date: 2018-09-27
Location: Botanical Gardens of the State of Georgia...Athens, Ga
Date: 2019-06-02
Lacecap Hydrangea - Twist-N-Shout 002
Uploaded by clintbrown
Location: KALAMA WA
  • Uploaded by Joy

Date: 2013-10-16
Location: Bordines Nursery, Rochester Hills, MI
Date: 2009-09-03
Location: Bordines Nursery, Rochester Hills, MI
Date: 2009-09-03
Location: Kalama, Wa.
  • Uploaded by Joy

Date: 2013-09-19
Location: Apple Valley MN
Date: 2016-10-21
Location: Kalama, Wa.
  • Uploaded by Joy

Date: 2014-08-04

Date: 2013-10-16

Date: 2013-09-19
Uploaded by clintbrown
Location: Western Washington
Date: 2014-10-08

Date: 2013-09-19
Location: al cook nursery 
Date: 2015-05-22

Date: 2013-10-16

Date: 2013-10-16

Date: 2013-10-16
Location: Kalama, Wa.
  • Uploaded by Joy

Date: 2013-09-19
Location: Bloomington, Illinois
Date: 2012-06-16
Location: My Northeastern Indiana Gardens - Zone 5b
Date: 2010-07-07

Date: 2014-08-04
Location: Maryland
Date: 2015-07-03
Location: KALAMA WA
  • Uploaded by Joy
This plant is tagged in:
Image

Comments:
  • Posted by frankrichards16 (Clinton, Michigan - Zone 5b) on Mar 4, 2018 8:36 AM concerning plant:
    Developed by Michael A. Dirr (University of Georgia Research Foundation, Inc). A cross-pollination of Hydrangea macrophylla 'Penny Mac' and Hydrangea macrophylla 'Lady in Red' (PP15175, 2004) producing the first re-blooming lacecap hydrangea. Marketed as Endless Summer® Twist-n-Shout® it has pink or periwinkle blue flowers and blooms on sturdy red stems. Note that the remontant trait comes from 'Penny Mac' while the lacecap flowers and red stems are from the female parent 'Lady in Red.'

    After Professor Dirr retired in 2003, he co-founded Plant Introductions, Inc. (or PII). Thus the registered name 'PIIHM-I' (PP20176, 2009) can be deciphered where HM stands for Hydrangea macrophylla and the -I represents the first one. A name that is often mistakenly printed as 'P11HM-1' or 'PIIHM-1' where one or more of the "I"s are replaced by the number 1.
  • Posted by eclayne (Pioneer Valley south, MA, USA - Zone 6a) on Dec 27, 2016 7:07 PM concerning plant:
    The proper spelling of this cultivar's name is questionable, possibly due to the use of san serif script.

    US PP20,176: Piihm-1 (but spelled Piihm-I in the body of the patent).
    Ca PBR3,688: Piihm-I
    AU PBR: Piihm-1
Plant Events from our members
chelle On September 16, 2014 Transplanted
Moved to W window hugel area, far NW corner.
aspenhill On July 20, 2014 Obtained plant
Betty's Azalea Ranch - qty 1
Catmint20906 On June 2, 2015 Bloomed
MissMew On May 18, 2018 Miscellaneous Event
Plant had rough winter but is now coming up from the ground
MissMew On June 2, 2016 Miscellaneous Event
Suzanne replaced plant
MissMew On September 1, 2014 Obtained plant
christine2 On May 25, 2020 Obtained plant
OV1
SuperHappyCamper On May 31, 2024 Obtained plant
Purchased from Busy B Nursery.
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