Amsonia Plants: Low-Maintenance Perennials for Vibrant Gardens

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Amsonia (am-soh-nee-uh), Blue Stars; Dogbane Family (Apocynaceae). Amsonia have small funnel-shaped flowers. Easily grown in average, medium, well-drained soil in full sun to part shade. Best fall foliage color usually occurs in full sun. Flowers generally last longer if given some afternoon shade in hot sun areas, however, stems may open up and flop with too much shade, however. Consider cutting back the stems by about 6 inches after flowering to help keep stems upright and to shape plants into a nice foliage mound.

This easy care, heat and humidity tolerant, deer resistant perennial is an excellent choice for gardeners looking for low maintenance or native perennials.

Attributes: Deer Resistant, Rabbit Resistant. Borders, rock gardens, native plant garden, cottage garden or open woodland area. Best when massed.

Amsonia

Amsonia 'Blue Ice' (25) BR Plants

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Amsonia

Amsonia 'Starstruck' PP32246 (25) BR Plants

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Amsonia

Amsonia 'String Theory' PP34419 (25) BR Plants

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Amsonia

Amsonia hubrechtii Blue Star (4) 1-gallons

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Amsonia

Amsonia hubrichtii 'Bluestar' (25) BR Plants

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Amsonia

Amsonia t. 'Storm Cloud' (25) BR Plants

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Amsonia

Amsonia 'Blue Ice' (25) BR Plants

Amsonia 'Blue Ice' (25) Bare Root Plants Common Name: Blue Star Navy blue buds in late spring, open to clusters of periwinkle blue, star-shaped flowers. Larger than the species it is also more compact and produces darker blue flowers. The narrow,...

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Amsonia

Amsonia 'Starstruck' PP32246 (25) BR Plants

Amsonia 'Starstruck' PP32246 (25) Bare Root PlantsCommon Name: Blue Star Although this plant will catch your eye in the spring with its sparkling star-shaped, sky blue flowers, you'll be wowed by what follows. An incredibly full habit of vibrant green...

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Amsonia

Amsonia 'String Theory' PP34419 (25) BR Plants

Amsonia 'String Theory' PP34419 CPBRAF (25) Bare Root PlantsCommon Name: Blue Star People have loved 'Storm Cloud' and we are now pleased to offer a complementing threadleaf Amsonia to the Proven Winners program. 'String Theory' can be described as a...

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Amsonia

Amsonia hubrechtii Blue Star (4) 1-gallons

Amsonia hubrechtii Blue Star (4) 1-gallonsCommon Name: Blue Star, Arkansas Amsonia This southern native has very narrow, needle-like leaves that line the stems like bottle brushes. Surprisingly, they are soft as silk to the touch. From late spring...

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Amsonia

Amsonia hubrichtii 'Bluestar' (25) BR Plants

Amsonia hubrichtii (25) Bare Root PlantsCommon Name: Blue Star, Arkansas Amsonia This southern native has very narrow, needle-like leaves that line the stems like bottle brushes. Surprisingly, they are soft as silk to the touch. From late spring thru...

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Amsonia

Amsonia t. 'Storm Cloud' (25) BR Plants

Amsonia tabernaemontana 'Storm Cloud' (25) Bare Root PlantsCommon Name: Bluestar ‘Storm Cloud’ is a very exciting new variety that performs well for both northern and southern growers. In spring, new stems emerge near-black with...

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What Is Amsonia?

Amsonia is a genus of flowering plants in the dogbane family, Apocynaceae. They are commonly known as bluestars because of their beautiful star-shaped blue flowers. Amsonia are native to North America, with one species in East Asia and another in the eastern Mediterranean. They are named in honor of the American physician John Amson.

There are about ten species of Amsonia, but the most common ones grown in gardens are:

Eastern bluestar (Amsonia tabernaemontana): This is the most widely grown species of Amsonia. It is a clump-forming perennial that grows to 3-4 feet tall and wide. It has blue flowers that bloom in late spring and early summer.

Thread-leaf bluestar (Amsonia hubrichtii): This species is similar to the eastern bluestar, but it has finer leaves and slightly smaller flowers. It grows to 2-3 feet tall and wide.

Ozark bluestar (Amsonia illustris): This species is taller than the other two, growing to 4-5 feet tall and wide. It has large, showy blue flowers that bloom in mid-summer.

Amsonia are easy to care for plants that are relatively pest and disease resistant. They prefer full sun to part shade and well-drained soil. They are drought tolerant once established, but they will appreciate some water during dry spells. Amsonia can be propagated by seed or division.

Here are some of the benefits of growing Amsonia in your garden:

Beautiful plants with star-shaped blue flowers that bloom in late spring and early summer.

Easy to care for and relatively pest and disease resistant.

Drought tolerant once established.

Nectar for bees and butterflies.

Touch of elegance to any garden.

How Do I Plant Amsonia?

Planting Amsonia is a relatively straightforward process, and with proper care, they will reward you with their charming blue blooms for years to come. Here is a step-by-step guide:

Choosing the right time:

The ideal planting time for Amsonia depends on your climate:

Spring: Plant in mid-spring when the danger of frost has passed and the soil has warmed up. This is the most common planting time in most regions.

Fall: Early fall is also a good option, especially in warmer climates. Planting then allows the roots to establish before winter sets in.

Selecting a location:

Sunlight: Amsonia thrives in full sun to part shade. In consistently moist soil, they can handle full sun well. However, in drier areas, some afternoon shade is beneficial. Avoid deep shade, as it can cause leggy growth and fewer flowers.

Soil: Amsonia prefers well-drained soil, even tolerating poor soil types like clay or sand. Amending the soil with compost or manure before planting can improve drainage and provide nutrients.

Planting process:

Dig a hole: Dig a hole two to three times wider and deeper than the root ball of your Amsonia plant.

Amend the soil: If needed, mix some compost or manure into the dug-out soil to improve drainage and fertility.

Position the plant: Gently remove the Amsonia from its container and place it in the hole, ensuring the root ball sits level with the surrounding soil.

Backfill and tamp: Fill the hole with the amended soil, gently tamping it down to remove air pockets.

Water thoroughly: Give your newly planted Amsonia a deep watering to settle the soil and hydrate the roots.

Aftercare:

Watering: Water regularly, especially during the first growing season, until the plant is established. After that, Amsonia is fairly drought tolerant, but water during prolonged dry spells.

Mulching: Apply a layer of mulch around the base of the plant to retain moisture, suppress weeds, and regulate soil temperature.

Fertilizing: Amsonia generally does not require heavy fertilization. A light application of compost or a balanced fertilizer in early spring can be beneficial.

Pruning: Deadheading spent flowers encourages continued blooming throughout the season. In late fall or early spring, cut back the entire plant to around 4-6 inches from the ground.

Additional tips:

Amsonia can be propagated by seed or division. However, starting with nursery-bought plants is generally easier and quicker.

If your Amsonia starts to flop over, it might be getting too much shade or rich soil. Consider providing some support or moving it to a sunnier location.

Amsonia is relatively pest and disease resistant, making it a low-maintenance addition to your garden.

By following these guidelines, you can successfully plant and care for Amsonia, enjoying their beautiful blue blooms for many seasons to come.

What Are The Different Varieties Of Amsonia?

The genus Amsonia boasts several charming varieties, each offering unique characteristics to enhance your garden. Here is a glimpse into some popular choices:

Eastern Bluestar (Amsonia tabernaemontana):

The most widely cultivated Amsonia, known for its graceful, willow-like foliage and clusters of star-shaped, sky-blue flowers in late spring and early summer.

Grows 3-4 feet tall and wide, forming attractive clumps.

Tolerates a wider range of soil conditions compared to other varieties.

Thread-leaf Bluestar (Amsonia hubrichtii):

A more delicate Amsonia with wispy, thread-like leaves that turn a stunning golden yellow in fall.

Produces smaller, light blue flowers compared to the Eastern Bluestar, blooming in mid to late spring.

Reaches a height of 2-3 feet and a spread of 2-3 feet.

Prefers well-drained soil and full sun.

Ozark Bluestar (Amsonia illustris):

The tallest of the bunch, growing 4-5 feet tall and wide with large, showy blue flowers blooming in mid-summer.

Features glossy, dark green leaves with fuzzy white undersides.

Attracts butterflies and hummingbirds.

Thrives in moist soil and full sun to part shade.

Other noteworthy varieties:

Louisiana Bluestar (Amsonia ludoviciana): Showcases hairy white undersides on its leaves and prefers consistently moist soil.

Peebles' Bluestar (Amsonia peeblesii): A rare, highly drought-tolerant variety native to Arizona.

Blue Ice (Amsonia 'Blue Ice'): A compact hybrid with deep lavender-blue flowers and vibrant fall foliage.

Storm Cloud (Amsonia tabernaemontana 'Storm Cloud'): Showcases dark green foliage with silver veins and deep periwinkle blue flowers.

When choosing an Amsonia variety, consider your desired height, flower color, foliage characteristics, and preferred growing conditions to find the perfect fit for your garden.

How Do I Care For Amsonia In My Garden?

Caring for Amsonia in your garden is relatively easy, and these charming plants will reward you with their beautiful blue blooms for years to come. Here is a summary of the key care points:

Watering:

Young plants: Water regularly, especially during the first growing season, until the plant is established. Aim for about 1-2 inches of water per week.

Established plants: Amsonia is fairly drought-tolerant once established. However, water during prolonged dry spells or periods of extreme heat. Avoid overwatering, as this can lead to root rot.

Soil:

Amsonia prefers well-drained soil, even tolerating poor soil types like clay or sand. Amending the soil with compost or manure before planting can improve drainage and fertility.

Avoid planting in overly fertile soil, as this can cause weak and floppy growth.

Sunlight:

Amsonia thrives in full sun to part shade. In consistently moist soil, they can handle full sun well. However, in drier areas, some afternoon shade is beneficial. Avoid deep shade, as it can cause leggy growth and fewer flowers.

Mulching:

Apply a layer of mulch around the base of the plant to retain moisture, suppress weeds, and regulate soil temperature. Use organic mulch like shredded bark, wood chips, or compost.

Fertilizing:

Amsonia generally does not require heavy fertilization. A light application of compost or a balanced fertilizer in early spring can be beneficial but avoid overdoing it.

Pruning:

Deadheading spent flowers encourages continued blooming throughout the season. Simply snip off the faded flower heads.

In late fall or early spring, cut back the entire plant to around 4-6 inches from the ground. This encourages new growth and maintains a tidy appearance.

Additional tips:

Amsonia can be propagated by seed or division, but nursery-bought plants are generally easier and quicker to establish.

If your Amsonia starts to flop over, it might be getting too much shade or rich soil. Consider providing some support or moving it to a sunnier location.

Amsonia is relatively pest and disease resistant, making it a low-maintenance addition to your garden.

By following these simple care guidelines, you can ensure your Amsonia thrives and adds its touch of elegance and beauty to your garden for many seasons.

Do Amsonia Plants Attract Pollinators?

Amsonia plants are excellent attractors of pollinators, particularly butterflies, hummingbirds, and bees. Here is why:

Suitable flowers:

Star-shaped blooms: The characteristic star-shaped flowers of Amsonia offer easy access to nectar for pollinators with long tongues, like butterflies and hummingbirds.

Nectar production: Amsonia flowers produce a sweet, sugary nectar that serves as a valuable food source for pollinators.

Color: The vibrant blue color of Amsonia flowers is particularly attractive to butterflies and hummingbirds, as they have excellent vision in the blue spectrum.

Specific pollinators:

Butterflies: Many butterfly species, including swallowtails, monarchs, and fritillaries, are drawn to Amsonia's nectar and pollen. The thread-leaf bluestar (Amsonia hubrichtii) is particularly known for attracting butterflies with its delicate flowers.

Hummingbirds: Ruby-throated hummingbirds and other hummingbird species readily visit Amsonia flowers for their nectar, especially in areas with fewer hummingbird-friendly plants.

Bees: While not the primary pollinators for Amsonia, some bee species, like bumblebees and carpenter bees, also visit the flowers to collect pollen.

Benefits of attracting pollinators:

Improved pollination: By attracting pollinators, Amsonia plants ensure better fruit and seed set, contributing to their overall health and reproduction.

Enhanced biodiversity: A pollinator-friendly garden with Amsonia supports a wider range of insect life, contributing to a healthier and more balanced ecosystem.

Beauty and enjoyment: Observing the busy activity of pollinators around Amsonia flowers adds another layer of interest and beauty to your garden.

Overall, Amsonia plants play a valuable role in supporting pollinator populations, making them a great choice for gardeners who want to create a wildlife-friendly haven.

Are There Any Common Pests Or Diseases That Affect Amsonia?

Amsonia plants are known for their remarkable resistance to pests and diseases, making them a low-maintenance choice for your garden. While a few issues can occasionally arise, they are relatively rare and easy to manage. Here is a breakdown of the most common concerns:

Pests:

Aphids: These sap-sucking insects may occasionally appear on Amsonia leaves, but their populations are rarely significant enough to cause harm. Natural predators like ladybugs and lacewings often keep aphid populations in check. If infestations become noticeable, you can simply hose them off with water or use a mild insecticidal soap.

Leaf beetles: Some species of leaf beetles may nibble on Amsonia leaves, but the damage is usually minimal. Again, natural predators usually control their populations effectively. If necessary, handpicking or organic insecticides can be used to manage infestations.

Diseases:

Mycosphaerella leaf spot: This fungal disease can cause brown spots on Amsonia leaves, but it rarely causes serious harm. Improving air circulation around the plants and avoiding overhead watering can help prevent its spread. Severely affected leaves can be removed, and fungicides can be used in extreme cases.

Rust: Under rare circumstances, Amsonia can be affected by rust, a fungal disease that causes orange or brown pustules on leaves. Similar to Mycosphaerella leaf spot, good air circulation and avoiding overhead watering can help prevent it. Fungicides can be used if necessary.

In summary, Amsonia plants are not typically plagued by pests or diseases. Their inherent resistance makes them a hassle-free choice for gardeners seeking low-maintenance beauty. However, it is always good practice to keep an eye on your plants and address any potential issues promptly to ensure their continued health and vigor.

Can I Use Amsonia In Floral Arrangements?

Amsonia is a beautiful and versatile flower that can be used in a variety of floral arrangements. Here is why it is a great choice:

Beautiful blooms: Amsonia's star-shaped flowers come in a range of blue shades, from pale periwinkle to deep lavender, adding a touch of elegance and tranquility to any arrangement.

Long-lasting: Amsonia flowers have a good vase life, typically lasting 7-10 days when cut and properly cared for.

Airiness and texture: The airy, wispy foliage of Amsonia provides a textural contrast to other flowers in the arrangement, adding interest and dimension.

Versatility: Amsonia can be used in a variety of arrangements, from rustic and cottage-style to modern and minimalist. It pairs well with a wide range of other flowers, including roses, lilies, hydrangeas, and peonies.

Here are some tips for using Amsonia in floral arrangements:

Cut the stems when the flowers are just starting to open. This will ensure they have a longer vase life.

Condition the stems by placing them in warm water for a few hours before arranging.

Use clean clippers or shears to cut the stems.

Remove any lower leaves that will be below the waterline in the vase.

Arrange the Amsonia in the vase with other flowers and greenery.

Keep the arrangement in a cool place out of direct sunlight.

Change the water in the vase every few days and add fresh flower food.

With its beautiful blooms, long-lasting nature, and versatility, Amsonia is a great addition to any floral arrangement.

Is Amsonia Invasive?

No, Amsonia is not considered an invasive plant. In fact, it is a great choice for gardeners who want low-maintenance, well-behaved perennials. Here is why:

Clumping habit: Amsonia forms neat clumps that slowly spread over time, unlike invasive plants that aggressively multiply and take over surrounding areas.

Limited self-seeding: While some Amsonia species may occasionally self-seed, it is usually infrequent and manageable. The seeds usually do not travel far from the parent plant, further minimizing the risk of invasiveness.

Easy control: If any unwanted spreading does occur, it is readily controlled by simply dividing the clumps and relocating them elsewhere in your garden.

Here are some additional reasons why Amsonia is a desirable choice for gardens:

Beautiful, long-lasting flowers: With their star-shaped blue blooms, Amsonia adds a touch of elegance and beauty to any landscape.

Low maintenance: They are drought-tolerant once established and require minimal care and feeding.

Attracts pollinators: Their flowers attract butterflies, hummingbirds, and bees, contributing to a healthy ecosystem.

Pest and disease resistant: Amsonia is rarely bothered by pests or diseases, making it a hassle-free addition to your garden.

Therefore, you can confidently plant Amsonia in your garden without worrying about it becoming invasive. Its charming blooms, ease of care, and ecological benefits make it a fantastic choice for any gardener.

When Is The Best Time To Divide Amsonia Plants?

There are two main ideal times to divide Amsonia plants: spring and fall:

Spring:

Early to mid-spring (before new growth emerges) is generally the preferred time for most climates. Dividing then allows the plants to establish new roots before the hot summer arrives.

This timing is particularly beneficial in cooler climates where late spring frosts are still a possibility. Dividing after frost danger has passed can potentially damage new growth.

Fall:

Early fall (after temperatures cool but before the first frost) can also be a good option for dividing Amsonia, especially in warmer climates where winters are mild.

Dividing in fall gives the plants a chance to establish some new roots before winter dormancy, setting them up for success in the following spring.

However, the exact best time within these seasons might depend on specific factors:

Climate: Consider your local climate and adjust the timing accordingly. In hot climates, early spring might be the only realistic option, while in mild climates, fall division might be preferable.

Plant maturity and health: Divide mature, healthy plants any time within the recommended seasons. However, avoid dividing younger or stressed plants, especially during hot or dry periods.

Blooming period: If your Amsonia variety blooms in late spring or summer, spring division is preferable to avoid interrupting its blooming cycle. Fall division might be a better option for varieties that bloom earlier in spring.

Ultimately, the best time to divide Amsonia plants is when you have the time and opportunity to do it properly, ensuring their optimal health and recovery. Consider the factors mentioned above and choose the timing that best suits your specific situation.

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Amsonia

Amsonia 'Blue Ice' (25) BR Plants

Amsonia

Amsonia 'Starstruck' PP32246 (25) BR Plants

Amsonia

Amsonia 'String Theory' PP34419 (25) BR Plants

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Amsonia hubrechtii Blue Star (4) 1-gallons

Amsonia

Amsonia hubrichtii 'Bluestar' (25) BR Plants

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Amsonia t. 'Storm Cloud' (25) BR Plants

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Amsonia 'Blue Ice' (25) BR Plants

Amsonia

Amsonia 'Starstruck' PP32246 (25) BR Plants

Amsonia

Amsonia 'String Theory' PP34419 (25) BR Plants

Amsonia

Amsonia hubrechtii Blue Star (4) 1-gallons

Amsonia

Amsonia hubrichtii 'Bluestar' (25) BR Plants

Amsonia

Amsonia t. 'Storm Cloud' (25) BR Plants