Rock Rice Flower Plant Care

Rock Rice Flower (Pimelea petrophila) belongs to the Thymelaeaceae family within the Pimelea genus. Rock Rice Flower is native to southern continental Australia.

Rock Rice Flower displays a compact, bushy shrub growth habit, reaching up to 2.5 ft tall with a spread of approximately 3 ft. Rock Rice Flower produces small clusters of pink, white, or yellow flowers.

Leaf size: approximately 2 inches.

Water a young or newly planted Rock Rice Flower 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.

Rock Rice Flower thrives in full sun to partial shade.

Pimelea petrophila tolerates temperatures of 60–75°F. Rock Rice Flower prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining acidic soil mix with added organic matter like peat moss or pine bark. Good drainage is essential for Rock Rice Flower to prevent waterlogging, which leads to root rot and fungal issues.

Feed Rock Rice Flower 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 acidic soil mix with added organic matter like peat moss or pine bark. Avoid low spots where water collects after rain.

Rock Rice Flower is suited to USDA Zone 13a.

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.

Rock Rice Flower can spread to about 3 ft (0.9 m) and reach about 3 ft (1 m) tall. Space plants about 3 ft (0.9 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 Rock Rice Flower 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.

Rock Rice Flower 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.

Rock Rice Flower can be propagated through softwood cuttings, seeds. Similar propagation techniques also apply to coastal rice flower plant care, which shares the same genus.

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

Rock Rice Flower 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.

Rock Rice Flower grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Rock Rice Flower is native to southern continental Australia. In cooler regions, grow Rock Rice Flower as a houseplant or bring it indoors before the first frost.