The Proven Winners Spirea Plant is easy to grow in nearly any garden. It's hardy in USDA zones 4-8, with many selections expanding that to 3-9, and it is even tolerant of a wide range of conditions, including poor soil, heat, cold, humidity, drought and urban pollution. Spirea isn't just low-maintenance; it also attracts butterflies and other insect pollinators. These flowering shrubs' delicate lacy flowers can be white, pink, red or mauve, and its finely toothed foliage comes in shades of green, chartreuse, gold, and blue, with some varieties putting on a showy fall display.