Blue Mountain Heath Plant Care

Blue Mountain Heath (Phyllodoce caerulea) belongs to the Ericaceae family within the Phyllodoce genus. Blue Mountain Heath is native to boreal regions around the Northern Hemisphere. Blue Mountain Heath is also known as Blue Heather.

Blue Mountain Heath displays a low spreading shrub growth habit, reaching up to 1.5 ft tall with a spread of approximately 2 ft. Blue Mountain Heath produces bell-shaped flowers in shades of pink, white, or purple.

Leaf size: approximately 2.5 inches.

Water a young or newly planted Blue Mountain Heath every 7–10 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.

Blue Mountain Heath thrives in partial shade to full shade. The optimal light range is 100–500 lux. Avoid placing Blue Mountain Heath in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Phyllodoce caerulea tolerates temperatures of 45–70°F. Blue Mountain Heath prefers humidity levels of 40–60%.

Well-draining acidic soil mix with peat moss and pine bark. Good drainage is essential for Blue Mountain Heath to prevent waterlogging, which leads to root rot and fungal issues.

Feed Blue Mountain Heath every 8 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 partial shade to full shade and well-draining acidic soil mix with peat moss and pine bark. Avoid low spots where water collects after rain.

Blue Mountain Heath is suited to USDA Zone 11b.

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.

Blue Mountain Heath can spread to about 2 ft (0.6 m) and reach about 2 ft (0 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 Blue Mountain Heath 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.

Blue Mountain Heath is frost-tender (hardy to USDA zone 11). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Blue Mountain Heath can be propagated through seeds, division of clumps. Similar propagation techniques also apply to pink mountain heather plant care, which shares the same genus.

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

Blue Mountain Heath is susceptible to spider mites, aphids, leafhoppers. 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.

Blue Mountain Heath grows outdoors in USDA Zone 11b. It survives winters down to planting zone 11b. Blue Mountain Heath is native to boreal regions around the Northern Hemisphere. In cooler regions, grow Blue Mountain Heath as a houseplant or bring it indoors before the first frost.