Blue Nemesia Plant Care

Blue Nemesia (Nemesia caerulea) belongs to the Scrophulariaceae family within the Nemesia genus. Blue Nemesia is native to the Cape Floristic Province of southwestern South Africa.

Blue Nemesia displays a low, spreading ground cover growth habit, reaching up to 0.5 ft tall with a spread of approximately 1 ft. Blue Nemesia produces small, tubular flowers in various colors like pink, purple, white, or yellow.

Leaf size: approximately 2 inches.

Water a young or newly planted Blue Nemesia 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.

Blue Nemesia thrives in full sun to partial shade.

Nemesia caerulea tolerates temperatures of 50–75°F. Blue Nemesia prefers humidity levels of 40–60%.

Well-draining, fertile soil with added organic matter like compost or peat moss. Good drainage is essential for Blue Nemesia to prevent waterlogging, which leads to root rot and fungal issues.

Feed Blue Nemesia 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 full sun to partial shade and well-draining, fertile soil with added organic matter like compost or peat moss. Avoid low spots where water collects after rain.

Blue Nemesia 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.

Blue Nemesia 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 Blue Nemesia 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 Nemesia 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.

Blue Nemesia can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to wallflower nemesia plant care, which shares the same genus.

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Blue Nemesia 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.

Blue Nemesia grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Blue Nemesia is native to the Cape Floristic Province of southwestern South Africa. In cooler regions, grow Blue Nemesia as a houseplant or bring it indoors before the first frost.