Small Isotoma Plant Care

Small Isotoma (Isotoma pusilla) belongs to the Campanulaceae family within the Isotoma genus. Small Isotoma is native to Western Australia.

Small Isotoma displays a low rosette, spreading growth habit, reaching up to 0.5 ft tall with a spread of approximately 1 ft. Small Isotoma produces star-shaped flowers in shades of blue, purple, or white.

Leaf size: approximately 2 inches.

Water a young or newly planted Small Isotoma every 3–5 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.

Small Isotoma thrives in partial shade to full sun.

Isotoma pusilla tolerates temperatures of 50–75°F. Small Isotoma prefers humidity levels of 40–70%.

Well-draining, fertile soil with added organic matter. Good drainage is essential for Small Isotoma to prevent waterlogging, which leads to root rot and fungal issues.

Feed Small Isotoma 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 shade to full sun and well-draining, fertile soil with added organic matter. Avoid low spots where water collects after rain.

Small Isotoma is suited to USDA Zone 12a.

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.

Small Isotoma can spread to about 1 ft (0.3 m) and reach about 1 ft (0 m) tall. Space plants about 1 ft (0.3 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 Small Isotoma 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.

Small Isotoma 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.

Small Isotoma can be propagated through seeds, division of clumps. Similar propagation techniques also apply to swamp isotome plant care, which shares the same genus.

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

Small Isotoma is susceptible to aphids, slugs, snails. 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.

Small Isotoma grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Small Isotoma is native to Western Australia. In cooler regions, grow Small Isotoma as a houseplant or bring it indoors before the first frost.