California Flannelbush Plant Care

California Flannelbush (Fremontodendron californicum) belongs to the Malvaceae family within the Fremontodendron genus. California Flannelbush is native to diverse habitats in southwestern North America. California Flannelbush is also known as Flannelbush, California Fremontia.

California Flannelbush displays an upright, sprawling shrub growth habit, reaching up to 6 ft tall with a spread of approximately 8 ft. California Flannelbush produces large, bright yellow cup-shaped flowers.

Leaf size: approximately 4 inches.

Water a young or newly planted California Flannelbush every 10–14 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.

California Flannelbush thrives in full sun.

Fremontodendron californicum tolerates temperatures of 50–90°F. California Flannelbush prefers humidity levels of 30–60%.

Well-draining sandy soil mix with some organic matter. Good drainage is essential for California Flannelbush to prevent waterlogging, which leads to root rot and fungal issues.

Feed California Flannelbush 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 mix with some organic matter. Avoid low spots where water collects after rain.

California Flannelbush 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.

California Flannelbush can spread to about 8 ft (2.4 m) and reach about 6 ft (2 m) tall. Space plants about 8 ft (2.4 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 California Flannelbush 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.

California Flannelbush 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.

California Flannelbush can be propagated through seeds, semi-hardwood cuttings. Similar propagation techniques also apply to mexican flannel bush plant care, which shares the same genus.

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

California Flannelbush 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.

California Flannelbush grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. California Flannelbush is native to diverse habitats in southwestern North America. In cooler regions, grow California Flannelbush as a houseplant or bring it indoors before the first frost.