Cylindrical Clarkia Plant Care

Cylindrical Clarkia (Clarkia cylindrica) belongs to the Onagraceae family within the Clarkia genus.

Cylindrical Clarkia displays an upright, branching growth habit, reaching up to 1.5 ft tall with a spread of approximately 0.5 ft. Cylindrical Clarkia produces colorful cup-shaped flowers in shades of pink, red, or purple.

Leaf size: approximately 2 inches.

Water a young or newly planted Cylindrical Clarkia 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.

Cylindrical Clarkia thrives in full sun to partial shade.

Clarkia cylindrica tolerates temperatures of 50–80°F. Cylindrical Clarkia prefers humidity levels of 40–60%.

Well-draining, sandy soil with good organic content. Good drainage is essential for Cylindrical Clarkia to prevent waterlogging, which leads to root rot and fungal issues.

Feed Cylindrical Clarkia 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 with good organic content. Avoid low spots where water collects after rain.

Cylindrical Clarkia 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.

Cylindrical Clarkia can spread to about 1 ft (0.2 m) and reach about 2 ft (0 m) tall. Space plants about 1 ft (0.2 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 Cylindrical Clarkia 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.

Cylindrical Clarkia 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.

Cylindrical Clarkia can be propagated through seeds. Similar propagation techniques also apply to farewell to spring plant care, which shares the same genus.

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Cylindrical Clarkia is susceptible to aphids, spider mites, whiteflies. 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.

Cylindrical Clarkia grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Cylindrical Clarkia as a houseplant or bring it indoors before the first frost.