shrub

Neon Flash Japanese Spirea

Spiraea japonica 'Neon Flash'

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Essentials

At a Glance

Plant Type

Shrub

Height

36 inches

Width

36 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Medium

Humidity

Average

Lifespan

15-20 years

Native To

Japan, China, Korea

Toxicity

Non-toxic

The Story

Plant Bio

Spiraea japonica is a dense, mounding, deciduous shrub known for its clusters of flowers and toothed, oval leaves. It is a tough and adaptable plant widely used in landscaping. 'Neon Flash' is distinguished by its intensely vibrant, electric reddish-pink flower clusters that rebloom if deadheaded. New foliage emerges with a reddish tinge, maturing to dark green, and turning a rich burgundy in fall.

Bloom Period:

EarlyLate

Uses & Benefits:

Provides a multi-season display with colorful new growth, vibrant summer flowers, and excellent fall foliage color. Its compact, mounding habit makes it a versatile design element in borders and mass plantings.

Its dense growth habit can help suppress weeds when planted en masse. It is a tough, adaptable shrub that tolerates a range of soil types and urban conditions, making it a reliable choice for difficult sites.

The flowers are a valuable source of nectar for various pollinators, including bees and butterflies, supporting local insect populations during the summer months.

Marketplace

Where to Buy

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Planting

How to Grow

Select a location with at least six hours of direct sunlight daily.
Dig a hole twice as wide as the root ball and just as deep.
Place the plant in the hole, ensuring the crown is level with the soil.
Backfill with native soil, firming gently around the base.
Water thoroughly after planting to settle the soil.
Apply a 2-inch layer of mulch to conserve moisture and suppress weeds.

Pro Tip

For the best rebloom, shear the entire plant back by about one-third after the initial flowering period finishes.

Keep It Thriving

Care Guide

Do

Provide consistent moisture, especially during the first year.
Prune in late winter or early spring to shape and rejuvenate.
Deadhead spent flowers to encourage a second, smaller bloom.
Plant in well-drained soil to prevent root issues.

Don't

Don't plant in deep shade, which reduces flowering and causes leggy growth.
Avoid overhead watering to minimize the risk of fungal diseases.
Don't let the soil dry out completely for extended periods.
Avoid heavy fertilization, which can promote foliage over flowers.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Fertilize
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vibrant mass planting for summer colorLow-maintenance foundation shrubColorful edging for perennial borders

Companion Plants

Hemerocallis 'Stella de Oro' Nepeta 'Walker's Low' Sedum 'Autumn Joy' Pennisetum alopecuroides 'Hameln' Coreopsis verticillata 'Moonbeam'

Multiply

Propagation Methods

Good to Know

Common Questions

Neon Flash Japanese Spirea questions

What zones can Neon Flash Japanese Spirea grow in?

Neon Flash Japanese Spirea is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Neon Flash Japanese Spirea deer resistant?

Yes — Neon Flash Japanese Spirea is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Neon Flash Japanese Spirea bloom?

Neon Flash Japanese Spirea typically blooms in early summer through mid-summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Neon Flash Japanese Spirea need full sun?

Neon Flash Japanese Spirea does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Neon Flash Japanese Spirea drought tolerant?

Yes — once established (usually after the first full season), Neon Flash Japanese Spirea handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.