Starry Monkeyflower Plant Care

Starry Monkeyflower (Diplacus stellatus) belongs to the Phrymaceae family within the Diplacus genus. Starry Monkeyflower is native to Cedros Island in the Mexican State of Baja California.

Starry Monkeyflower displays an upright, spreading shrub growth habit, reaching up to 3 ft tall with a spread of approximately 4 ft. Starry Monkeyflower produces tubular flowers in shades of red, orange, or yellow.

Leaf size: approximately 3 inches.

Water a young or newly planted Starry Monkeyflower 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.

Starry Monkeyflower thrives in full sun to partial shade.

Diplacus stellatus tolerates temperatures of 50–85°F. Starry Monkeyflower prefers humidity levels of 40–70%.

Well-draining sandy loam with added organic matter. Good drainage is essential for Starry Monkeyflower to prevent waterlogging, which leads to root rot and fungal issues.

Feed Starry Monkeyflower 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 loam with added organic matter. Avoid low spots where water collects after rain.

Starry Monkeyflower 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.

Starry Monkeyflower can spread to about 4 ft (1.2 m) and reach about 3 ft (1 m) tall. Space plants about 4 ft (1.2 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 Starry Monkeyflower 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.

Starry Monkeyflower 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.

Starry Monkeyflower can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to narrowleaf bush monkeyflower plant care, which shares the same genus.

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

Starry Monkeyflower is susceptible to spider mites, aphids, 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.

Starry Monkeyflower grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Starry Monkeyflower is native to Cedros Island in the Mexican State of Baja California. In cooler regions, grow Starry Monkeyflower as a houseplant or bring it indoors before the first frost.