Growth Rate
Moderate to Fast: Spirea shrubs generally have a moderate to fast growth rate. They can grow approximately 1 to 3 feet per year, depending on the species and growing conditions.
Size
Mature Height: Depending on the species and cultivar, Spirea can range from 1.5 to 8 feet in height.
Mature Spread: The spread can vary from 2 to 10 feet, forming a rounded to mounding shape.
Popular Varieties
Spiraea japonica (Japanese Spirea): Typically 2 to 4 feet tall and wide.
Spiraea x vanhouttei (Vanhoutte Spirea): Can grow up to 6 to 8 feet tall and wide.
Spiraea bumalda (Bumald Spirea): Usually reaches 2 to 3 feet in height and spread.
Growing Conditions
Sunlight: Prefers full sun but can tolerate partial shade.
Soil: Adaptable to various soil types, though it prefers well-drained soil.
Watering: Moderate water requirements, with increased watering needed during dry periods.
Hardiness Zones: Suitable for USDA hardiness zones 3-9, depending on the species.