Silver sedge Plant Care

Silver sedge (Ceratocaryum argenteum) belongs to the Restionaceae family within the Ceratocaryum genus. Silver sedge is native to the Cape Provinces of South Africa.

Silver sedge displays a clumping, upright grass-like growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Silver sedge produces small inconspicuous flowers in clusters.

Leaf size: approximately 12 inches.

Water a young or newly planted Silver sedge every 7–14 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.

Silver sedge thrives in full sun to partial shade.

Ceratocaryum argenteum tolerates temperatures of 50–80°F. Silver sedge prefers humidity levels of 40–70%.

Well-draining sandy soil mix with high organic content. Good drainage is essential for Silver sedge to prevent waterlogging, which leads to root rot and fungal issues.

Feed Silver sedge 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 well-draining sandy soil mix with high organic content. Avoid low spots where water collects after rain.

Silver sedge 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.

Silver sedge can spread to about 2 ft (0.5 m) and reach about 2 ft (1 m) tall. Space plants about 2 ft (0.5 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 Silver sedge 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.

Silver sedge 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.

Silver sedge can be propagated through division, seeds.

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Silver sedge is susceptible to spider mites, mealybugs. 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.

Silver sedge grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Silver sedge is native to the Cape Provinces of South Africa. In cooler regions, grow Silver sedge as a houseplant or bring it indoors before the first frost.