Amsonia Plant | How to Grow, Propagate, and Take Care of Them?

Bluestar is a natural perennial herb that grows in thickets and damp, muddy, fertile, comprehensive, and mountainous woodlands. Amsonia is found in Japan, Turkey, central and the northeastern United States, and southeastern Europe, growing in grassland and forest.

Amsonia growth habit is erect and clump-forming. Late spring sees clusters of 3/4″ light blue star-like flowers appear on upright, green stems. Moreover, it has narrow, willow-shaped foliage that turns yellow in the fall. Cut the plant to the ground or leave it for winter interest. The popular name blue star comes from the loose clusters of half-inch blue flower petals covering the plant in late spring and early summer. Furthermore, the plant keeps looking excellent in the yard after the blooms die, and the leaves develop into a bright yellow-gold color in the fall. Besides, this Amsonia blue starflower grows nicely in beds and borders and near forest streams and cottage yards.

Belonging to Arkansas blue star perennial plants, the family is composed of 20 varieties of clump-forming plants that have long-lasting blue blooms. Learn more about their growth and how to take care of them below. 

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Amsonia Plant Features

Botanical Name


Common Name

Commonly called a “blue star.”

Plant Type

This is a herbaceous perennial


It belongs to the Apocynaceae family.

Native Range

Arkansas, Oklahoma

Hardiness Zones

Zone ranges from 5-8

Plant Size

The height and width of the plant are 2′ to 3′.

Blooming Time

Flowers bloom between April to May.

Flower Color

Powdery blue

Sun Exposure

Full sun to partial shade




It is a low-maintenance plant.


It fascinates butterflies.

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Where to Plant Amsonia?

The best place to plant this flower is an enriched, well-drained soil, clay, loam, or sand of any pH range. Planting them in full sunshade will yield beautiful flower colors. Moreover, they are best suited to borders and flower beds.

How to Grow Amsonia Plants?

You can grow them in the following ways:

  1. Make amendments in the planting area with the help of coarse grit and organic matter to improve drainage.
  2. Then dig a hole big enough to fit the root ball’s width and depth.
  3. Insert your seedling in the hole. To help the roots set in, water them regularly and thoroughly.  However, use an 8cm (3in) mulching layer after sowing to avoid water evaporation.

Growing Conditions

They are easily cultivated in full sunlight to medium partial shade, moderate, well-drained, and fertilized soil. The full sun produces the best fall foliage color in scorching sun places, but blossoms survive longer if given some midday shade. In the excess dye, stems start opening up and collapse. After blooming, prune the branches by approximately 6″ to help maintain them erect and form them into a lovely leaf heap.

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How to Propagate Amsonia Plant?

Amsonia makes a beautiful display from the highlands to the seaside and is one of our most attractive native flora. Oblong-shaped, pod-like fruits with firm, black seeds that can be utilized for replication follow the pale blue flowers. The leaf contains a deadly white latex that makes the plant resistant to many herbivores, including deer. When it is entirely grown, it also becomes drought resistant.

Propagation of Amsonia

They germinate when propagated by seed, but the plant does not blossom until the second year. When the plant is inactive, you can divide it in the fall and spring to ensure each split has at least one eye. Then, to avoid self-seeding, deadhead the flowers. Be careful while handling this plant, and wear protective gloves when dealing with it.

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How to Care Amsonia Plant ?

While taking care of this plant, keep the following points in mind.

  1. Amsonia will need to be watered regularly during the summer, particularly during droughts, to avoid growth retardation.
  2. Nourish each plant with fertilizer and cut back to a height of 10″ once the blooms have faded.
  3. A nutrient soil and a layer of organic mulch are optimal growth conditions for them. Spread the layer of at least 3″ of organic mulch around the plants, such as crushed leaves, bark, or pine straw. As the mulch decomposes, it minimizes water evaporation and supplies nutrients to the soil.
  4. Give each plant a shovelful of compost when the blossoms fade and trim plants growing in the shadow to a height of 10″.
  5. Do not let the soil dry out, mainly if the plants are thriving in direct sunlight.
  6. Whenever the soil seems dry on top, water deeply and slowly to enable the soil to absorb as much moisture as possible without being wet. In the fall, stop watering.
  7. Due to its floppy appearance, the plant may have to be supported if this is not practicable.
  8. After the stems have flowed, cut them back to give them a more rounded, sleeker look.

Pests/Disease Problems

The Amsonia plants have no dangerous disease or pests/insect problems. However, the plant may flop significantly when not cut back after blooming. Besides, it is susceptible to rust.

Uses of Amsonia Plant

You can plant them in the following places to enhance their beauty.

  1. Native plant garden
  2. Rock gardens
  3. Borders
  4. Open woodland area
  5. Cottage garden

Therefore, consider growing Amsonia plants or blue star plants if you want to add distinctive features to your garden area and seasonal intrigue. This flower is a native of North America with a long blooming season. It has willowy foliage that makes a nice, spherical mound in the spring. Moreover, it also has a great accent to blue landscape designs. Willow blue star and blue willow star are two primary varieties readily available from nurseries and seed sources.

These beautiful blue blooms resemble little stars and are helpful in a border, at a woodland edge, or in a wildflower garden. From spring until summer, they are in full bloom. In the fall, the leaves of some species become a brilliant golden, offering another season of appeal. Regardless of the fall color, the foliage is lovely throughout the growing season.

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