Spiraea is a genus of roughly 80—100 species of deciduous flowering shrubs in the rose family (Rosaceae). Per Missouri Botanical Garden, the genus spans from North America to Eastern Asia, with most garden cultivars derived from East Asian species. They divide cleanly into two bloom categories: spring-blooming (on old wood, white-flowered) and summer-blooming (on new wood, typically pink to rose).
I don't grow spirea at my place in Melville, Long Island — they're common in the neighborhood but the deer browse them regularly. What follows is sourced from Cooperative Extension and the Missouri Botanical Garden.
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Spring-blooming spireas (bloom on old wood)
Spring-blooming spireas set flower buds on the previous season's stems. Prune them immediately after flowering, not in fall or early spring, or you cut off the blooms.
Spiraea thunbergii (Thunberg's spirea)
One of the earliest shrubs to bloom in late winter to early spring — typically late February to March in zone 6—7 — S. thunbergii produces small white flowers along graceful arching stems before the leaves fully emerge. Per Missouri Botanical Garden, it is hardy in zones 4—8 and reaches 3—5 feet tall by 4—6 feet wide.
Cultivar: 'Ogon' (also sold as 'Mellow Yellow') — golden-yellow foliage through summer, orange-red in fall; same bloom habit as the species; per NC State Extension, one of the best foliage spireas for four-season interest.
Our pruners pick
The Felco F-2 is the gold standard — cuts up to 1-inch branches cleanly, every part replaceable, will outlast you. Read our full pick.
Spiraea × vanhouttei (Bridal wreath spirea)
The classic arching white spirea. Per Missouri Botanical Garden, this hybrid between S. trilobata and S. cantoniensis reaches 6—8 feet tall by 10—12 feet wide, with cascading white bloom clusters in May. Hardy zones 3—8. The sheer size and arching habit make it a specimen or back-of-border shrub, not a foundation plant.
'Renaissance' is a disease-resistant selection with improved mildew resistance; per Illinois Extension, it blooms slightly later than the straight species, which can help it avoid late frosts in zone 4.
Spiraea prunifolia (Bridalwreath spirea)
Distinct from S. × vanhouttei despite sharing a common name. S. prunifolia produces double white flowers (resembling tiny buttonhole roses) tightly clustered along upright stems, then brilliant orange-red fall foliage. Per Clemson HGIC, it is hardy in zones 4—8 and reaches 4—9 feet tall. Less commonly sold than vanhouttei but worth seeking out for the fall color alone.
Summer-blooming spireas (bloom on new wood)
Summer-blooming spireas can be cut back hard in late winter or early spring — to 6—12 inches — and they will regrow and bloom the same season. This hard pruning also prevents the woody, open-centered appearance that develops on neglected plants.
Spiraea japonica (Japanese spirea)
The most widely sold summer-blooming group. Per Penn State Extension, S. japonica is hardy in zones 3—8 and blooms June—August with flat-topped pink to carmine flower clusters. Its compact habit makes it ubiquitous in foundation plantings.
Caution: Spiraea japonica is on the invasive watch list in several states. Per Pennsylvania Department of Conservation and Natural Resources, it has naturalized in disturbed areas of the Mid-Atlantic and Appalachian region. In Connecticut, it is listed as potentially invasive. Check your state before planting.
Best cultivars:
- 'Little Princess' — 2—3 ft × 3—4 ft; rose-pink flowers June—July; per Missouri Botanical Garden, one of the most compact and reliable selections
- 'Anthony Waterer' — 3—4 ft, deep carmine-pink flowers, long bloom season; the classic commercial selection; occasional variegated foliage sport makes it easy to identify
- 'Goldflame' — orange-gold new growth maturing to yellow-green, then orange-red in fall; pink flowers; 2—3 ft; one of the best foliage spireas in the group
- 'Magic Carpet' (also 'Walbuma') — 1.5—2 ft; red-orange new growth, yellow-green summer foliage; per NC State Extension, the most compact in the japonica group
- 'Double Play Gold' (Proven Winners) — golden foliage, pink flowers, 2—3 ft; per Proven Winners cultivar data, marketed as improved mildew resistance versus 'Goldflame'
- 'Double Play Big Bang' — 3—4 ft; large rosy-red flowers, better rebloom than older selections; PW introduction
Spiraea douglasii (Douglas spirea)
A Pacific Northwest native species, hardy in zones 5—9, with upright rose-pink flower spikes (not flat-topped like japonica) in July—August. Per Oregon State University: Spiraea douglasii, it reaches 3—6 ft and is well-suited to moist sites and rain gardens. Not widely sold outside the West Coast market; usually available as straight species.
Comparative table
| Cultivar | Height | Season | Zones | Notes |
|---|---|---|---|---|
| S. thunbergii 'Ogon' | 3—5 ft | Spring + foliage | 4—8 | Golden foliage, earliest bloom |
| S. × vanhouttei | 6—8 ft | Spring | 3—8 | Classic arching white; large |
| S. prunifolia | 4—9 ft | Spring + fall | 4—8 | Double flowers, excellent fall color |
| 'Little Princess' | 2—3 ft | Summer | 3—8 | Most compact japonica |
| 'Anthony Waterer' | 3—4 ft | Summer | 3—8 | Classic carmine-pink |
| 'Goldflame' | 2—3 ft | Summer + foliage | 3—8 | Best foliage color change |
| 'Magic Carpet' | 1.5—2 ft | Summer + foliage | 3—8 | Lowest-growing japonica |
Pruning
The key mistake is treating all spireas the same. Per Clemson HGIC:
- Spring-blooming types: Prune immediately after flowering. Removing more than one-third of the plant at once weakens it.
- Summer-blooming types: Cut back hard in late winter to 6—12 inches before new growth begins. They will rebloom on new stems.
Deadheading summer bloomers (removing spent flower clusters) encourages repeat bloom in many japonica cultivars.
Common problems
| Symptom | Cause | Fix |
|---|---|---|
| White powdery coating on leaves, late summer | Powdery mildew | Improve air circulation; apply neem oil or potassium bicarbonate; 'Renaissance' and 'Double Play' selections have improved resistance |
| Sparse flowering on spring bloomers | Pruned at wrong time (fall or early spring) | Prune only immediately after bloom |
| Woody, open center; sparse growth | Infrequent hard pruning on summer types | Cut back to 12 in. in late winter every 2—3 years |
| Foliage reversion to green on variegated types | Normal; remove all-green shoots promptly | Prune reverted shoots to the base as soon as noticed |
Frequently asked questions
Are spirea deer-resistant? Per Rutgers NJAES deer resistance ratings, most Spiraea species are rated "frequently severely damaged." They are not a reliable choice in high-deer-pressure landscapes without physical protection.
How far back can I cut summer-blooming spirea? To 6—12 inches from the ground, per Clemson HGIC. Do this in late winter before new growth begins. This hard renewal pruning produces the most vigorous regrowth and the best flower display.
Is Spiraea japonica invasive in my area? Invasive status varies by state. It is on watch lists in Pennsylvania, Connecticut, and several Mid-Atlantic states. Per Penn State Extension, check your state's invasive plant list before purchasing. If invasive risk is a concern, substitute S. thunbergii or S. prunifolia.
Can I grow spirea in partial shade? Most spireas tolerate partial shade (3—4 hours of direct sun) but flower less prolifically than in full sun. Per Missouri Botanical Garden, foliage-colored cultivars like 'Goldflame' lose their color intensity in shade, reverting toward green.
Sources
- Missouri Botanical Garden — Spiraea genus overview
- Missouri Botanical Garden — Spiraea × vanhouttei
- NC State Extension — Spiraea thunbergii 'Ogon'
- NC State Extension — Spiraea japonica
- Penn State Extension — Spiraea
- Clemson HGIC — Spiraea
- Illinois Extension — Spirea bloom and culture
- Oregon State Extension — Oregon State University: Spiraea douglasii
- Pennsylvania DCNR — Invasive plants
- Rutgers NJAES — Deer-resistant plants