Prostanthera stenophylla Plant Care

Prostanthera stenophylla (Prostanthera stenophylla) belongs to the Lamiaceae family within the Prostanthera genus. Prostanthera stenophylla is native to Wollemi National Park in New South Wales.

Prostanthera stenophylla displays an upright, bushy shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Prostanthera stenophylla produces small, tubular flowers in shades of purple, pink, or white.

Leaf size: approximately 2 inches.

Water a young or newly planted Prostanthera stenophylla 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.

Prostanthera stenophylla thrives in full sun to partial shade.

Prostanthera stenophylla tolerates temperatures of 50–80°F. Prostanthera stenophylla prefers humidity levels of 40–70%.

Well-draining, slightly acidic soil with added organic matter like compost or peat moss. Good drainage is essential for Prostanthera stenophylla to prevent waterlogging, which leads to root rot and fungal issues.

Feed Prostanthera stenophylla 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, slightly acidic soil with added organic matter like compost or peat moss. Avoid low spots where water collects after rain.

Prostanthera stenophylla 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.

Prostanthera stenophylla can spread to about 2 ft (0.6 m) and reach about 3 ft (1 m) tall. Space plants about 2 ft (0.6 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 Prostanthera stenophylla 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.

Prostanthera stenophylla 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.

Prostanthera stenophylla can be propagated through softwood cuttings, semi-hardwood cuttings.

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Prostanthera stenophylla 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.

Prostanthera stenophylla grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Prostanthera stenophylla is native to Wollemi National Park in New South Wales. In cooler regions, grow Prostanthera stenophylla as a houseplant or bring it indoors before the first frost.