Koidzumi's Firethorn Plant Care

Koidzumi's Firethorn (Pyracantha koidzumii) belongs to the Rosaceae family within the Pyracantha genus. Koidzumi's Firethorn is also known as Taiwan Firethorn.

Koidzumi's Firethorn displays an upright, dense shrub growth habit, reaching up to 10 ft tall with a spread of approximately 8 ft. Koidzumi's Firethorn produces clusters of small white flowers in spring, followed by orange to red berries.

Leaf size: approximately 2 inches.

Water a young or newly planted Koidzumi's Firethorn 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.

Koidzumi's Firethorn thrives in full sun to partial shade.

Pyracantha koidzumii tolerates temperatures of 50–85°F. Koidzumi's Firethorn prefers humidity levels of 40–70%.

Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Koidzumi's Firethorn to prevent waterlogging, which leads to root rot and fungal issues.

Feed Koidzumi's Firethorn 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 to partial shade and well-draining loamy soil with added compost for nutrients. Avoid low spots where water collects after rain.

Koidzumi's Firethorn 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.

Koidzumi's Firethorn can spread to about 8 ft (2.4 m) and reach about 10 ft (3 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 Koidzumi's Firethorn 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.

Koidzumi's Firethorn 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.

Koidzumi's Firethorn can be propagated through softwood cuttings, hardwood cuttings. Similar propagation techniques also apply to firethorn plant care, which shares the same genus.

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

Koidzumi's Firethorn is susceptible to aphids, scale insects, spider mites. 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.

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