Slender Spirea Plant Care

Slender Spirea (Spiraea tenuifolia) belongs to the Rosaceae family within the Spiraea genus. Slender Spirea is native to east-central Europe, Kazakhstan, all of Siberia, the Russian Far East, Mongolia, northern China, Korea, and Japan, and it has been widely introduced to the rest of Europe and to eastern North America.

Slender Spirea displays an upright, spreading shrub growth habit, reaching up to 5 ft tall with a spread of approximately 6 ft. Slender Spirea produces clusters of small white, pink, or red flowers.

Leaf size: approximately 3 inches.

Water a young or newly planted Slender Spirea every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Slender Spirea thrives in full sun to partial shade.

Spiraea tenuifolia tolerates temperatures of 0–90°F. Slender Spirea prefers humidity levels of 40–70%.

Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Slender Spirea to prevent waterlogging, which leads to root rot and fungal issues.

Feed Slender Spirea every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with full sun to partial shade and well-draining loamy soil with added compost for nutrients. Avoid low spots where water collects after rain.

Plant container-grown or balled-and-burlapped trees in spring or early autumn, setting the root flare at soil level, and water well after planting.

Slender Spirea can spread to about 6 ft (1.8 m) and reach about 5 ft (2 m) tall. Space plants about 6 ft (1.8 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the tree spacing calculator.

Prune Slender Spirea while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the tree in one year.

Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.

Young and container-grown trees need extra protection: roots in a pot freeze much more easily than roots in the ground.

Slender Spirea can be propagated through softwood cuttings, division of roots, seeds. Similar propagation techniques also apply to bridal wreath spirea plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Slender Spirea is susceptible to aphids, spider mites, leaf rollers. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.