Light Needs
Mature Height
Mature Spread
Growing Zones
Hydrangea macrophylla ‘COF-HM3’, commonly called Rock 'n Roll Hydrangea, has large mophead blooms. The large flower clusters come in bright pink, purple and dreamy blue, and stand out against a backdrop of luscious green foliage. This hydrangea reblooms in late summer, and its sturdy stems ensure that the blooms will never flop or droop. These low maintenance beauties are worth the space in your garden!
Rock 'n Roll has a mounding, upright, bushy shape. It reaches 4 - 5 high and as wide at maturity. This rock star is extremely cold-hardy down to -30° F. It prefers morning sun and afternoon shade and grows best in moist soil. Use these star performers in a privacy screen, pollinator garden, or cut-flower bed. Rock 'n Roll attracts butterflies and other pollinators, while deer don’t usually bother with it.
Rock 'n Roll™ Hydrangea Care
Rock 'n Roll Hydrangea prefers part-sun exposure and moist soil conditions. It can burn in the hot afternoon sun and will need regular water during the summer. Like most hydrangeas, Rock 'n Roll grows best in rich soil with plenty of organic matter. The pH of your soil will determine flower color: acidic soil brings out blue hues, alkaline soil leads to pink, and neutral soil promotes purple tones. Cover the root zone with a heap of mulch to reduce water evaporation and nurture the soil.
This mophead hydrangea blooms on old and new wood. Prune in early spring before the first flush of blooms. Cut back dead and damaged branches, and shape to control size.
Rock 'n Roll™ Hydrangea Spacing
Space these hydrangeas 4 feet apart, center on center, if growing as a tight hedge. For foundation planting, site shrubs at least 6 feet from your home with plenty of clearance from overhead eaves to ensure plantings will not get too dry. Hydrangeas will develop a deep root system and should only be grown in containers temporarily.
Rock 'n Roll™ Hydrangea Plant Facts
Growing Conditions
- Hardiness ZonesGrowing Zones
- USDA Zones 5 to 8 (perennial); grown as an annual elsewhere (outdoors year-round); grown indoors elsewhere (outdoors year-round); grown in containers elsewhere (grown as a seasonal crop)
- Sun Exposure
- Part Sun to Full Sun (5+ Hours Direct Sun)
- Mature Height
- 4-5 Feet
- Mature Spread
- 4-5 Feet
- Growth Rate
- Moderate
- Growth Habit
- , Upright, Mounded
- Water Needs
- Consistently Moist
Flowers & Foliage
- Flower Colors
- , Blue, Pink, Purple
- Flower Description
- Deep Red, White, Multi Colored
- Bloom Time
- Early to Late Summer
- Blooms On
-
Both New and Old Wood
?
"Blooms on" tells you which stems produce flowers, which decides when it's safe to prune.
- New Wood: Flowers form on stems that grow this season. Prune in late winter or early spring without losing blooms.
- Old Wood: Flower buds form on last year's stems. Prune right after flowering. Pruning in fall or early spring removes next year's blooms.
- Both New and Old Wood: Blooms on last year's stems and again on new growth, so it flowers even after a hard winter or a mistimed pruning. Prune lightly after the first flush of blooms.
- When to Prune
- Lightly, right after the first flush of flowers
- Foliage Color
- , Green
- Foliage Description
- Green
- Foliage Type
- , Deciduous
- Seasonal Interest
- , Summer Flowering, 3 Season Interest
Garden Benefits
Plant Overview
- Common Name
- Rock 'n Roll™ Hydrangea
- Botanical Name
- HYDRANGEA M 'ROCK-N-ROLL'
- Brand
- Plants That Work
- Plant Type
- Shrub
Simple Plant Spacing Calculator
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons
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Plant Addicts ships to the lower 48 states within the U.S. Unfortunately, we do not currently ship to Alaska, Hawaii, or internationally.
This plant cannot be shipped to the following states: AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations. Other plants may still be available for shipping to these states.
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