Spiraea, Japanese Meadowsweet, Japanese Spirea, Maybush 'Neon Flash'

Spiraea x bumalda

Family: Rosaceae (ro-ZAY-see-ee) (Info)
Genus: Spiraea (spy-REE-ah) (Info)
Species: x bumalda (boo-MAHL-dah) (Info)
Cultivar: Neon Flash
Synonym:Spiraea japonica



Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade



Foliage Color:

Unknown - Tell us


24-36 in. (60-90 cm)

36-48 in. (90-120 cm)


36-48 in. (90-120 cm)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

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)

Where to Grow:

Unknown - Tell us


Unknown - Tell us

Bloom Color:



Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

Patent Information:

Unknown - Tell us

Propagation Methods:

From leaf cuttings

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


This plant is said to grow outdoors in the following regions:

San Jose, California

Susanville, California

Algonquin, Illinois

Spring Grove, Illinois

Springfield, Illinois

Logansport, Indiana

Worthville, Kentucky

Millersville, Maryland

Bridgewater, Massachusetts

Westland, Michigan

Lincoln, Nebraska

Raleigh, North Carolina

Mogadore, Ohio

Baker City, Oregon

Salem, Oregon

Lansdowne, Pennsylvania

Pittsburgh, Pennsylvania

West Chester, Pennsylvania

Knoxville, Tennessee

Kaysville, Utah

Falls Church, Virginia

College Place, Washington

MOXEE, Washington

Beverly, West Virginia

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Gardeners' Notes:


On Aug 5, 2015, Rickwebb from Downingtown, PA wrote:

I sold some at a nursery in West Chester, PA, over a few years in the early 2000's. It was a new cultivar for me. It is very similar to Anthony Waterer and Froebel. It is a little more compact with rich red-pink flower clusters. New growth is reddish in spring and the foliage is dark green. It was introduced into the US trade by Brookside Gardens in Wheaton, Maryland from Japan. It is an easy, reliable, inexpensive plant like most all the Japanese and Bumald Spireas.


On Jun 29, 2013, nutsaboutnature from Algonquin, IL (Zone 5a) wrote:

This is the third year for my 'Neon Flash'. When I bought it from Bluestone Perennials it was a tiny little thing in a small pot as it was shipped by mail. It even came with it's own slow-release fertilizer "pill".

The flower clusters started out small, but this year they've really spread!

It survived a very soggy bed after an extremely wet spring this year that killed some of my other plants.

The flower color is a gorgeous, almost fluorescent...a Hot Deep Pink.

I was shown at a nursery how Spirea can be sheared back... and shaped if you want...over and over, which may even promote reblooming.

Love it!!


On May 2, 2006, sharonmi from Westland, MI (Zone 6a) wrote:

Mine are just gorgeous every year. They are planted in full sun, and I cut them almost to the ground in early spring. They are quite easy to propogate from stem cuttings.


On Jan 16, 2006, Gabrielle from (Zone 5a) wrote:

I bought this a number of years ago on clearance, and I'm not sure I'm really liking it. Perhaps I'm just not into Spirea. It blooms and does well enough, but at this point, it is just filling space and may be removed if that space is needed for something else.