When to plant spireas?
- Botanical name
- Spiraea
- Family
- Rosaceae
Spireas are planted from October to March.
Spireas are woody perennials.
Two groups of spiraea exist, and each flowers on wood of a different age. The spring flowering kinds lay down their flower buds in the previous summer, so a cut while dormant takes the flowers away. Those flowering in early summer do so on the current year's shoots, and a dormant cut costs them nothing.
The spring flowering kinds spread considerably wider than those that flower in early summer, so more room is measured out for them at planting.
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Spireas through the year
- planting
- pruning (spring-flowering)
- pruning (early-summer-flowering)
In short
Growing conditions
Are spireas toxic to cats and dogs?
No. Spireas are not toxic to cats and dogs.
Pests and diseases
Listed here is every problem for which the sources name this plant as a host. The problems are not listed in order of how common they are.
- Signs
- A white, floury coating spreads over the leaves, first on the lower and older ones. The leaf under it yellows and dries up. The fruit stays small, because the plant loses leaf surface.
- Prevention
- Plant resistant varieties, leave an airy spacing and sun, and clear the debris at the end of the season. Unlike most fungi it is not helped by wet foliage, since it spreads in heat and high air humidity, in a dry summer too.
- What to do
- Oil products meant for powdery mildew on the squash family work on contact. They do not cure a leaf that is already affected, but they stop the spread to healthy ones. On herbs cut the affected shoots back instead, since the new growth comes clean. On ornamental perennials what is left is spacing and moisture.
Check the registration and the label before use.
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Related plants
The plants below are in the same botanical family (Rosaceae).
Sources about the plant: DGUV Information 202-023 „Giftpflanzen, GBIF Backbone Taxonomy, Iowa State University Extension, NC State Extension Plant Toolbox, Royal Horticultural Society, South Dakota State University Extension, University of Illinois Extension, Wikidata. Checked between 14 and 28 August 2026. The problem descriptions also draw on: Clemson Cooperative Extension, KGZS, UF/IFAS Extension, University of Maryland Extension, University of Wisconsin-Madison Division of Extension, Utah State University Extension.