Rhaphispermum gerardioides Plant Care

Rhaphispermum gerardioides (Rhaphispermum gerardioides) belongs to the Orobanchaceae family within the Rhaphispermum genus.

Rhaphispermum gerardioides displays a low rosette, clumping growth habit, reaching up to 1.5 ft tall with a spread of approximately 1.5 ft. Rhaphispermum gerardioides produces small tubular flowers in shades of pink, purple, or white.

Leaf size: approximately 8 inches.

Water a young or newly planted Rhaphispermum gerardioides 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.

Rhaphispermum gerardioides thrives in bright indirect to medium light. Avoid placing Rhaphispermum gerardioides in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Rhaphispermum gerardioides tolerates temperatures of 65–80°F. Rhaphispermum gerardioides prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining, rich loamy soil mix with added perlite for extra drainage. Good drainage is essential for Rhaphispermum gerardioides to prevent waterlogging, which leads to root rot and fungal issues.

Feed Rhaphispermum gerardioides 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 bright indirect to medium light and well-draining, rich loamy soil mix with added perlite for extra drainage. Avoid low spots where water collects after rain.

Rhaphispermum gerardioides is suited to USDA Zone 13b.

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.

Rhaphispermum gerardioides can spread to about 2 ft (0.5 m) and reach about 2 ft (0 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 Rhaphispermum gerardioides 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.

Rhaphispermum gerardioides is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Rhaphispermum gerardioides can be propagated through seeds, division of offsets.

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Rhaphispermum gerardioides is susceptible to aphids, 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.

Rhaphispermum gerardioides grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. In cooler regions, grow Rhaphispermum gerardioides as a houseplant or bring it indoors before the first frost.