Island Bush Poppy Plant Care

Island Bush Poppy (Dendromecon harfordii) belongs to the Papaveraceae family within the Dendromecon genus. Island Bush Poppy is also known as Harford's Bush Poppy.

Island Bush Poppy displays an upright, bushy shrub growth habit, reaching up to 5 ft tall with a spread of approximately 4 ft. Island Bush Poppy produces bright yellow cup-shaped flowers.

Leaf size: approximately 3 inches.

Water a young or newly planted Island Bush Poppy every 7–14 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Island Bush Poppy thrives in full sun.

Dendromecon harfordii tolerates temperatures of 50–90°F. Island Bush Poppy prefers humidity levels of 30–70%.

Well-draining sandy soil with good aeration. Good drainage is essential for Island Bush Poppy to prevent waterlogging, which leads to root rot and fungal issues.

Feed Island Bush Poppy every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees 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 and well-draining sandy soil with good aeration. Avoid low spots where water collects after rain.

Island Bush Poppy is suited to USDA Zone 12a.

Plant container-grown or balled-and-burlapped trees in spring or early autumn, setting the root flare at soil level, and water well after planting.

Island Bush Poppy can spread to about 4 ft (1.2 m) and reach about 5 ft (2 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 tree spacing calculator.

Prune Island Bush Poppy 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 tree in one year.

Island Bush Poppy 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.

Island Bush Poppy can be propagated through seeds, softwood cuttings. Similar propagation techniques also apply to bush poppy plant care, which shares the same genus.

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

Island Bush Poppy 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.

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