Spirea
Spiraea japonica
Spirea is one of the few woody shrubs that produces aspirin-like salicylic acid in its leaves — the original chemical name 'aspirin' comes from Spiraea's old genus name 'Spiraeic acid' from which it was first isolated in 1853.
How to care for spirea
Shear back by 1/3 after first bloom for an automatic second flush 6 weeks later. Tolerates hard renewal pruning to 6 inches every 3-4 years. Newer cultivars (Magic Carpet, Little Princess) have chartreuse spring foliage that turns burgundy in fall.
Garden uses & design ideas
Best garden use
Use it as structure near paths, fences, or foundation beds, leaving enough mature width so pruning stays light and natural.
Pair it with
Boxwood, Roses, Daylily make easy companion choices because they share similar light, water, or visual texture needs.
Layout tip
Match it with full sun exposure, place it in a moderate-water bed where soil can stay evenly damp but not soggy, and check USDA zones 4-8 before planting. Use the garden planner to test spacing around its mature size: 2-4 ft tall and wide.
Gardener note — Double-check local invasive, edible, and toxicity guidance with your county extension office before planting around pets, children, or natural areas.
Companion plants
Spirea grows well alongside these — similar light, water, and texture needs.
Common pests & problems
Where it grows best
Native to Japan, Korea, China; thrives in USDA hardiness zones 4-8.
Frequently asked about spirea
What USDA zones does Spirea grow in?+
Spirea is hardy in USDA zones 4-8. Outside these zones, it can usually be grown indoors or as a seasonal annual.
How much sun does Spirea need?+
Spirea prefers full sun. Place it where it gets that light most of the day for best growth and flowering.
How often should I water Spirea?+
Spirea has moderate water needs. Keep soil consistently moist but not soggy. Shear back by 1/3 after first bloom for an automatic second flush 6 weeks later. Tolerates hard renewal pruning to 6 inches every 3-4 years. Newer cultivars (Magic Carpet, Little Princess) have chartreuse spring foliage that turns burgundy in fall.
How big does Spirea get?+
Spirea reaches a mature size of 2-4 ft tall and wide. Growth rate is fast, so plan spacing accordingly when planting.
What plants grow well with Spirea?+
Spirea pairs well with Boxwood, Roses, Daylily, Catmint. These companions share similar care requirements and don't compete aggressively for resources.
What pests affect Spirea?+
Common Spirea problems include aphids; fire blight (rare); essentially deer-resistant. Catching early signs in routine inspection prevents most damage.
When does Spirea bloom?+
Spirea blooms in early summer (and again with deadheading) in pink, white, deep crimson. Deadheading spent flowers (where applicable) often encourages a longer bloom window.
Design a garden with spirea in minutes
Drag plants into a 3D space, walk through it, or upload a photo and let AI redesign it. Test spacing around its mature size before you plant.
More plants to design with
Pair well with spirea or suit the same spot.
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