Amsonia hubrichtii

Amsonia hubrichtii, commonly known as Arkansas blue star, Arkansas amsonia or threadleaf bluestar, grows 36 inches tall and 36 inches wide in a mounded form. This hardy perennial grows in hardiness zones 4-9 and is a versatile North American native ideal for many landscaping uses in all types of yards and gardens. It was named “Perennial Plant of the Year” 2011 by the Perennial Plant Association. We also carry the variety called ‘Blue Ice’, which grows to only 1-1.5′ tall.

Amazing Seasonal Interest

Unlike many plants that truly shine only for one season, Amsonia hubrichtii offers a variety of features throughout the seasons. From late spring to early summer, 2-3-inch wide clusters of small, light blue, star-shaped flowers are borne above the delicately soft, ferny or lacey foliage. The alternate-arranged, narrow leaves are a marvelous bright green in spring and summer, but turn a bright yellow-golden color which is second to none among herbaceous perennials in fall. In winter, the foliage can hold its shape and support snowfall, creating a beautiful mounding effect in the winter landscape.

Caring for Amsonia hubrichtii

These plants thrive in full sun to partial shade and perform best in average, moist, well-drained soil with a neutral (7.0) pH. Full sun will promote the best autumn color, but spring and summer blooms will be more prominent in a part-shade location. In a full shade location or when planted in too-rich soil, however, the plant may tend to open up and flop over, losing its full mounding traits. Though initially slow to grow and less lush and attractive when young, once established, it can tolerate drier conditions. Having no known severe insect or disease problems, other than minor occurrences of Mycosphaerella leaf spot and rust, this is a very easy to care for perennial.

After the flowers have faded, cutting back the foliage to 6-8 inches will help keep the mounds full and compact. Late season growth will fill in the plant in plenty of time for its showstopping autumn color. When the plants are large, they can be divided for transplanting to add even more specimens to the landscape.

In the Landscape

Amsonia is a real asset in borders, native gardens, cottage gardens or open woodland areas. Because of this plant’s versatility, it is also ideal in rock gardens or even rain gardens in well-drained soil. It is best when planted in masses and very attractive when mixed with ornamental grasses and other plants that have attractive seed heads. It tolerates deer and attracts butterflies, making it wildlife-friendly as well.

The outstanding ornamental qualities, ease of maintenance and many uses make Amsonia an invaluable perennial selection for any gardener.

Plants for Wet Soil

More water is always good for plants, right? Wrong! When water stands in the soil, air is displaced, which in turn smothers the plant roots. Once the roots are damaged many symptoms appear on leaves and shoots including wilting, marginal and inter-veinal browning of leaves (scorch), poor color and stunted growth. But the excess water isn’t always coming from overwatering, it may be the result of poor draining soil.

Poor drainage is often produced in disturbed sites when heavy clay soil is compacted by construction machinery or other excessive use, such as yards where several children are often playing. Areas cultivated for plantings, such as flowerbed or borders, then collect water running off the compacted ground – this is called the teacup effect. Wet areas may also be the result of swales, drain spout runoff and low areas even when soil percolation is adequate in most of the site but when general moisture levels are routinely high.

To check for a potential drainage problem, dig a hole at least 2 feet deep, fill it with water and note how long the water remains. If it doesn’t drain completely away within 24 hours a severe drainage problem exists.

Fortunately, you can correct drainage problems in different ways. Easy options include…

  • Divert water past plantings using drainage pipes, splash blocks or rain chains.
  • Plant in mounds or raised beds so water will run off and away from the plants.
  • Install drain tiles in saturated areas or use French drains to contain excess water.
  • Amend the soil with organic matter such as compost to improve its structure.

An even easier solution is to simply select plants that tolerate wet sites. The following trees and shrubs tolerate wet sites and flooding better than most. Few tolerate standing water for long periods (those that grow in truly swampy conditions are marked *), but all will do better in wet areas.

Shade Trees

  • *Acer rubrum/Red Maple
  • *Betula nigra/River Birch
  • Liquidambar styraciflua/Sweet Gum
  • Alyssa sylvatica/Sour Gum
  • Platanus occidentalis/Sycamore
  • Quercus phellos/Willow Oak
  • *Salix spp./Willow
  • *Taxodium distichum/Bald Cypress

Flowering Trees

  • Amelanchier Canadensis/Serviceberry
  • Magnolia virginiana/Sweetbay Magnolia

Evergreen Trees

  • Calocedrus decurrens/Incense Cedar
  • Ilex opaca/American Holly
  • Thuja occidentalis/Pyramidal Arborvitae

Deciduous Shrubs

  • *Aronia arbutifolia/Chokeberry
  • Clethra alnifolia/Summersweet
  • *Cornus spp./Twig Dogwoods
  • Enkianthus campanulatus/Enkianthus
  • Ilex verticillata/Winterberry
  • *ltea virginica/Virginia Sweetspire
  • Lindera benzoin/Spicebush
  • Myrica pennsylvanica/Bayberry
  • *Rhododendron viscosum/Swamp Azalea
  • *Salix spp./Pussy Willow
  • Viburnum spp./Viburnums

Evergreen Shrubs

  • *Andromeda polifolia/Bog Rosemary
  • *Chamaecyparis thyoides/White Atlantic Cedar
  • *llex glabra/Inkberry
  • Kalmia atifolia/Mountain Laurel
  • Leucothoe spp./Leucothoe

Perennials

  • *Arundo donax/Giant Reed Grass
  • Aster nova-angliae/Asters
  • Astilbe spp./Astilbe
  • Chelone/Turtlehead
  • Cimicifuga racemose/Snakeroot
  • Helenium autumnale/Helen’s Flower
  • Hibiscus moscheutos/Hardy Hisbiscus
  • *Iris kaempferi/Japanese Iris
  • Iris siberica/Siberian Iris
  • *Lobelia cardinalis/Cardinal Flower
  • Lobelia syphilitca/Blue Lobelia
  • Monarda didyma/Bee Balm
  • Myosotis scorpiodes/Forget-me-nots
  • Tiarella cordifolia/Foam Flower
  • Trollius europaeus/Globe Flowers
  • Viola spp./Violets

Ground Covers

  • Gallium odoratum/Sweet Woodruff
  • Gaultheria procumbers/Wintergreen
  • Hosta spp./Hosta
  • Mentha spp./Mint
  • Parthenocissus quinquifolia/Virginia Creeper

Annuals

  • Cleome hosslerana/Spider Flower
  • Myosotis sylvatica/Forget-me-nots
  • Torenia fournien/Wishbone Flower
  • Viola wittrockiana/Pansies

Not sure which water-loving plants to choose? We’d be happy to help you evaluate your landscape moisture and other conditions to help you choose the very best plants for your yard!

Contact Us

  • Visit us.
    315 Coleman Road
    McDonald, PA 15057
    (724) 926-2541
  • Follow us.

Store Hours

Monday – Sunday 9:00 – 5:00pm