Blueflower Safflower Plant Care

Blueflower Safflower (Carthamus caeruleus) belongs to the Asteraceae family within the Carthamus genus. Blueflower Safflower is also known as Blue Safflower, Carduncellus caeruleus.

Blueflower Safflower displays an upright, branching shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Blueflower Safflower produces bright orange, thistle-like flowers.

Leaf size: approximately 4 inches.

Water a young or newly planted Blueflower Safflower 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.

Blueflower Safflower thrives in full sun.

Carthamus caeruleus tolerates temperatures of 60–80°F. Blueflower Safflower prefers humidity levels of 40–60%.

Well-draining sandy loam with added organic matter. Good drainage is essential for Blueflower Safflower to prevent waterlogging, which leads to root rot and fungal issues.

Feed Blueflower Safflower 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 and well-draining sandy loam with added organic matter. Avoid low spots where water collects after rain.

Blueflower Safflower 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.

Blueflower Safflower 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 Blueflower Safflower 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.

Blueflower Safflower 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.

Blueflower Safflower can be propagated through seeds. Similar propagation techniques also apply to glaucous safflower plant care, which shares the same genus.

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Blueflower Safflower 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.

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