Platostoma palustre Plant Care

Platostoma palustre (Platostoma palustre) belongs to the Lamiaceae family within the Platostoma genus.

Platostoma palustre displays an upright, spreading shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Platostoma palustre produces small tubular flowers in shades of purple, pink, or white.

Leaf size: approximately 4 inches.

Water a young or newly planted Platostoma palustre 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.

Platostoma palustre thrives in partial to full sun.

Platostoma palustre tolerates temperatures of 60–80°F. Platostoma palustre prefers humidity levels of 40–70%.

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

Feed Platostoma palustre 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 partial to full sun and well-draining loamy soil with added compost for nutrients. Avoid low spots where water collects after rain.

Platostoma palustre is suited to USDA Zone 13a.

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.

Platostoma palustre can spread to about 2 ft (0.6 m) and reach about 3 ft (1 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 Platostoma palustre 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.

Platostoma palustre is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Platostoma palustre can be propagated through stem cuttings, division. Similar propagation techniques also apply to platostoma hispidum plant care, which shares the same genus.

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

Platostoma palustre 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.

Platostoma palustre grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. In cooler regions, grow Platostoma palustre as a houseplant or bring it indoors before the first frost.