Spirea, Bloomin' Easy® Pop Rocks® Rainbow Fizz™ SpireaRainbow Fizz Spirea is a compact spreading deciduous shrub with oval sharp toothed foliage that emerges a copper that fades to yellow before maturing to bright green then turns to copper red in fall. Flat topped clusters of neon pink flowers cover the plant throughout summer to mid fall. Best color in full sun and well drained soils. Removed spent flowers to encourage additional bloom. Type: Shrub Origins: Japan Height: 3' 4' Spread: 3 4' Spacing: 3.