Blue Potato Bush Plant Care

Blue Potato Bush (Solanum praetermissum) belongs to the Solanaceae family within the Solanum genus. Blue Potato Bush is also known as Blue-flowered Potato Bush.

Blue Potato Bush displays an upright, branching shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Blue Potato Bush produces small star-shaped flowers in clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted Blue Potato Bush 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 Potato Bush thrives in full sun to partial shade.

Solanum praetermissum tolerates temperatures of 60–85°F. Blue Potato Bush prefers humidity levels of 40–70%.

Well-draining, fertile loamy soil with added compost. Good drainage is essential for Blue Potato Bush to prevent waterlogging, which leads to root rot and fungal issues.

Feed Blue Potato Bush every 4 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 loamy soil with added compost. Avoid low spots where water collects after rain.

Blue Potato Bush 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.

Blue Potato Bush 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 Blue Potato Bush 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 Potato Bush 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.

Blue Potato Bush can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to trailing nightshade plant care, which shares the same genus.

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

Blue Potato Bush is susceptible to aphids, whiteflies, 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.

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