Schrenk's Spiraeanthus Plant Care

Schrenk's Spiraeanthus (Spiraeanthus schrenkianus) belongs to the Rosaceae family within the Spiraeanthus genus. Schrenk's Spiraeanthus is native to Kazakhstan and possibly Kyrgyzstan. Schrenk's Spiraeanthus is also known as Schrenk's Spiraea.

Schrenk's Spiraeanthus displays a compact, mounding shrub growth habit, reaching up to 3 ft tall with a spread of approximately 4 ft. Schrenk's Spiraeanthus produces clusters of small, fragrant white or pink flowers.

Leaf size: approximately 3 inches.

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

Schrenk's Spiraeanthus thrives in full sun to partial shade.

Spiraeanthus schrenkianus tolerates temperatures of 50–80°F. Schrenk's Spiraeanthus prefers humidity levels of 40–70%.

Rich, well-draining loamy soil with added compost for nutrients. Good drainage is essential for Schrenk's Spiraeanthus to prevent waterlogging, which leads to root rot and fungal issues.

Feed Schrenk's Spiraeanthus every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs 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 rich, well-draining loamy soil with added compost for nutrients. Avoid low spots where water collects after rain.

Schrenk's Spiraeanthus is suited to USDA Zone 12a.

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

Schrenk's Spiraeanthus can spread to about 4 ft (1.2 m) and reach about 3 ft (1 m) tall. Space plants about 4 ft (1.2 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 plant spacing calculator.

Prune Schrenk's Spiraeanthus 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 shrub in one year.

Schrenk's Spiraeanthus is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Schrenk's Spiraeanthus can be propagated through softwood cuttings, division of root ball, seeds.

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

Schrenk's Spiraeanthus is susceptible to aphids, spider mites, scale insects. 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.

Schrenk's Spiraeanthus grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Schrenk's Spiraeanthus is native to Kazakhstan and possibly Kyrgyzstan. In cooler regions, grow Schrenk's Spiraeanthus as a houseplant or bring it indoors before the first frost.