Blue tweedia - Oxypetalum coeruleum (Care, Characteristics, Flower, Images)

Blue tweedia

Blue tweedia (Oxypetalum coeruleum) is an evergreen perennial that will grow to 99 cm long. Leaves are heart shaped and provide a nice background to the pale blue, star-shaped flowers. It blooms from summer to fall. A common name for this plant is the Southern star. Although it is a perennial, it is sometimes grown as an annual in the garden due to its tendency to grow a bit scraggly.

Scientific classification

Species

Blue tweedia (Oxypetalum coeruleum)

Gentians, dogbanes, madders, and allies

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1 m

Plant Height

60 cm to 90 cm

Spread

Green

Leaf Color

2.5 cm

Flower Size

Blue

Flower Color

Green, Blue

Stem Color

Evergreen

Leaf type

20 - 41 ℃

Ideal Temperature

Summer

Growth Season

Images of Blue tweedia

Culture

Interesting Facts

The genus name means “pointed petal” and the species name honors the flower’s beautiful cyan/cerulean color that deepens to purple later in the season. Oxypetalum coeruleum has earned the Royal Horticultural Society’s Award of Garden Merit. The plant produces interesting boat-shaped seed pods containing tufted seeds that are dispersed by the wind.

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Quickly Identify Blue tweedia

Twining perennial reaching 2-3 feet (60-90 cm) tall, but can grow up to 10 feet (3 meters) with support.

Long, gray-green leaves covered in fine, soft hair, about 4 inches (10 cm) in length.

Clusters of star-shaped pale blue flowers with darker turquoise centers during summer.

Blue five-petaled flowers fading to soft purple, each petal 0.5 to 1 inch (1.3 to 2.5 cm) long.

Distinct heart-shaped leaves with a dull green color, 2-4 inches (5-10 cm) in length.

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Care Guide for Blue tweedia

Every week

Water

Full sun

Sunlight

20 - 41 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Blue tweedia prefers well-drained soil and consistent moisture, tolerating brief dry periods. Weekly watering is ideal, and it thrives outdoors in full sun during its growing season. Proper light and hydration balance are essential for optimal growth.

Fertilize: Blue tweedia thrives with balanced fertilizers, especially high phosphorus during blooming. Fertilize bi-weekly in spring and summer, monthly in fall, and only if needed in winter. Always water before fertilizing, adjusting amounts based on growth signals and seasonal changes to avoid root damage.

Pruning: Blue tweedia features vibrant blue flowers and delicate leaves. Prune in late winter to early spring to encourage growth and shape, removing dead stems. Regular pruning boosts flower production and ensures good airflow. Always sterilize tools to prevent disease transmission.

Propagation: Blue tweedia is easily propagated by surface-sowing seeds, requiring light for germination. Use well-draining soil and maintain consistent moisture without oversaturation. Warm temperatures and ample sunlight promote growth, but patience is essential, as germination may take several weeks.

Repotting: Blue tweedia requires repotting every 2-3 years in spring, using a pot 20% larger to support its roots. After repotting, use well-draining soil, maintain regular watering, and protect from direct sunlight to aid recovery and encourage growth.

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Images of Blue tweedia

Culture

Quickly Identify Blue tweedia

Care Guide for Blue tweedia

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