Threadleaf bluestar (Amsonia hubrichtii)

Threadleaf bluestar

Also known as: Bluestar, Hubricht's amsonia, Narrow leaf blue star

Threadleaf bluestar (Amsonia hubrichtii) is named after the brilliant biologist Leslie Hubricht, who was the first person to encounter it in the wilderness back in the '40s. It's an immensely popular garden plant used in borders, rock gardens, and cottage gardens. Threadleaf bluestar perfectly complements perennials that bloom in the fall, such as garden mums and sedums.

Scientific classification

Species

Threadleaf bluestar (Amsonia hubrichtii)

Gentians, dogbanes, madders, and allies

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Toxic to Humans

Toxicity

Perennial, Annual

Lifespan

Herb

Plant Type

Late spring, Summer

Bloom Time

Fall

Harvest Time

60 cm to 90 cm

Plant Height

60 cm to 90 cm

Spread

Green, Yellow, Gold

Leaf Color

1.3 cm

Flower Size

Blue, White

Flower Color

Spring

Growth Season

Slow

Growth Rate

Images of Threadleaf bluestar

Culture

Garden Use

Threadleaf bluestar is appreciated for the unique dimension it adds to a garden through three seasons - blue spring blooms, green summer lushness, and golden autumn color. It can be used in borders and makes the biggest impression when mass-planted. It is a great addition to cottage gardens, rock gardens, and woodland gardens. Cultivated native prairie landscapes are also a natural fit.

Symbolism

Endurance, strength and determination

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Toxicity

The plant threadleaf bluestar produces sap that is mildly toxic upon contact with skin and harmful if ingested. Cats and dogs may experience symptoms like gastrointestinal upset, vomiting, or diarrhea if they consume large amounts of threadleaf bluestar. Immediate veterinary care is advised for suspected poisoning. Use gloves when handling threadleaf bluestar to prevent skin irritation.

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Quickly Identify Threadleaf bluestar

Feathery green foliage forms a dense and airy mound up to 3 feet (90 cm) tall and wide.

Terminal clusters of 1/2 inch (1.3 cm) sky-blue star-shaped blooms in spring.

Elongated pods, 2-3 inches (5-7.5 cm) long, with linearly arranged seeds.

Needle-like leaves, 2-3 inches (5-7.5 cm) long, turn golden in full sun.

Green, milky-sapped stems up to 3 feet (90 cm) tall with smooth branching structure.

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Care Guide for Threadleaf bluestar

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Originating from North America's grasslands, threadleaf bluestar thrives in well-drained soils and full sun. Drought-tolerant once established, it requires minimal watering, ideally every week. During the growing season, regular rainfall supports its delicate foliage and star-shaped blooms.

Fertilize: Fertilize threadleaf bluestar with a balanced, slow-release fertilizer in spring and apply quarterly, adjusting frequency during warmer months. Reduce fertilization in fall for dormancy preparation. Always water after application and watch for signs of over-fertilization, as too much can harm threadleaf bluestar's health.

Pruning: Threadleaf bluestar features delicate foliage and star-shaped blue flowers. Prune in early to late spring and reduce height by one-third post-bloom for better shape and growth. Regular pruning prevents legginess, while sanitizing tools helps avert disease, promoting a healthy, attractive plant.

Propagation: The optimal propagation season for threadleaf bluestar is Spring, utilizing the preferred sowing method. It has moderate difficulty and propagates successfully from new growth. Key factors for success include maintaining adequate moisture and using well-drained soil.

Repotting: Threadleaf bluestar, a graceful perennial, grows up to 3 feet tall. Repot every 2-3 years in early spring using a container one size larger to prevent crowding. After repotting, provide ample water and partial shade for recovery, emphasizing gentle care due to its moderate care requirements.

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Images of Threadleaf bluestar

Culture

Toxicity

Quickly Identify Threadleaf bluestar

Care Guide for Threadleaf bluestar

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