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'String Theory' Bluestar Amsonia

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Plant Size Info

'String Theory' bluestar (Amsonia) is a native perennial from Proven Winners that offers a fusion of textured foliage, mesmerizing blooms, and unwavering reliability. During the spring, this Bluestar blooms with clusters of small light blue flowers full of nectar that pollinators can't get enough of. Come fall, 'String Theory' Bluestar takes on a cozy fall color with finely textured pine-like needles turning an attractive golden yellow. This Bluestar variety is more compact and boasts thinner foliage than other Bluestars, making it perfect for tucking in small spaces or a container!

Vital details:

Size: 22" tall x 36" wide

Light: Full sun (6+ hrs/day), part sun (4-6 hrs/day)

Water: Average soil & moisture. Drought-tolerant once established.

Hardiness: USDA zone 4-9 (Find your hardiness zone)

Pollinator value: Attracts butterflies and other pollinators who use it as a host plant.

Notable features: Native, Proven Winners, deer-resistant, fall color, drought-tolerant

Plant name: Amsonia 'String Theory'

Amsonia String Theory bluestar has clusters of delicate blue flowers bloom in the spring.
Amsonia String Theory bluestar has vibrant textured foliage in the fall.


Care & Planting Guide

After your plants have arrived:

The plants in this box have just spent a lot of time being jostled around in the dark and must be unboxed right away. Unpack the entire box, removing packaging material and plants. Remove any plastic covering the pot and/or soil surface and check if the soil is dry. Water anything that is dry or looks wilted. Any plants that have come unpotted during shipping can be replaced in their pots and their roots covered with soil.

Place plants in a cool, shaded spot out of direct sunlight for 24- 48 hours after unpacking them. This allows them a recovery and acclimation period before planting. If you must hold them longer, place them out of direct sunlight, wind, heat, and cold. Check daily for watering.

Our Guarantee

Our Guarantee

No Risk 60 Day Guarantee

We guarantee that you will be satisfied with your purchase and that your plants will arrive healthy, free of pests and diseases, and true to name.  If for any reason you are dissatisfied, notify us within 60 days of receipt of your order and we will refund you.

Fall Guarantee

Notify us within 7 days if you have a concern about orders shipped in autumn so we can make a note of it.  Warranty on such plants is extended to May 31 of the following year.  Our fall guarantee does not cover plants that are not hardy (i.e., able to survive winter) in your area, so please verify your USDA hardiness zone before purchasing. If you have questions about whether a plant can survive winter in your area, please call us before purchasing.

Our Larger Root Systems

We ship jumbo size plants with hefty root systems that outperform smaller plants obtained from other mail order nurseries.


We take great pride in our packaging.  Please contact us immediately if any of your boxes arrive damaged, or if you find any shortages or inconsistencies in the order. Please note: multiple boxes shipped by Fed Ex might not always arrive the same day. For more information, please see our shipping page.

Dormant Plants

Any plant shipped dormant in the spring is guaranteed to break dormancy even if it takes more than one month.  Call us directly if you have any concerns.


Photos of the plant(s) will be required so that we may provide the best assistance possible.


A plant refund is based on the plant cost less discounts and shipping charges.  Allow up to 2 weeks for processing.  We reserve the right to request a return of an item. Click here to request a refund.

Product Care

After 60 days, we cannot be responsible for product that is in your care.  This includes overwintering, animals, insects, diseases, poor planting, plants beyond their hardiness zone, drought, flooding, etc.  Our expert staff is here to assist you with any problem you may be experiencing.  Our goal is that you are successful with our product.

Our Record

Our parent company,, has successfully shipped high quality plants for more than ten years.  We take the same pride in the quality of plants sold here at

USDA Hardiness Zones

USDA Hardiness Zones Map


The United States Department of Agriculture (USDA) has devised a system to provide gardeners with a basic guide to plant hardiness – how much winter cold a plant can withstand. The Hardiness Zone Map system divides the United States and Canada into numbered zones based on lowest average winter temperature. Even within a zone, different micro-climates exist, such as large urban areas which may be warmer or land situated at different elevations.


The Hardiness Zone Map is a valuable tool but it is not foolproof. There are a variety of factors that can influence the hardiness of a given plant in a garden. These factors include: soil type, drainage, snow cover, exposure to wind, winter, rainfall (or lack of), as well as fluctuations in temperature.


When you are on a plant page, scroll down until you see the bold "Hardiness" text.

Shipping Policy

Use collapsible tabs for more detailed information that will help customers make a purchasing decision.

Ex: Shipping and return policies, size guides, and other common questions.

Shipping Policy

How to Contact Us: 
General Customer Service & Phone Orders:
Phone: 1-877-447-4769 (Monday-Friday 9:00 AM to 3:00 PM EST).
Mail:, 12601 120th Avenue, Grand Haven, MI 49417

Shipping costs

We try to keep shipping rates as low as possible to offer you the best value. Unlike other companies, with us, when you buy more, you save more on shipping! Our standard rates are:

 Order Value:

Shipping Cost:

$0.01 – $39.99


$40.00 – $59.99 


$60.00 – $99.99


$100.00+ FREE


Don't worry: our discount rates don't mean we cut corners on shipping. Our professional shipping staff packs each order - each plant! - with the care they'd take in their own gardens. Your plants will arrive in good, healthy condition, ready for you and your visiting pollinators to enjoy. 

Customer Reviews

Based on 5 reviews

It looks thriving, still wait and see. Grow almost double size of it, quart size when is delivered.

Very unique plant and flower.

Arrived looking very healthy. Quickly started growing through fall and blooming already in March here in GA Unique flowers. Will plant more!

Penny M.
Beautiful Flowers

It came nice and healthy

So far so good

Plant took to its place in the garden without any problems. Happy and healthy

Lyla T.
String Theory. - barely hanging on by a thread

I purchased quite a few of these and planted them in different areas and different conditions to see where they would thrive. None have. All are barely hanging on. Full sun, partial sun, partial shade, full shade, the areas run the gamut in water retention and I supplemental water when needed. I’ll probably purchase again in the Fall to see if the problem was just being planted in the middle of Summer, but overall…I’m unimpressed when I really really wanted to love them.

Hello! We're sorry to hear that you had some trouble with your plants. Our horticulture team is always available to help out and provide guidance. They can be reached at

All of our plants are covered under our 60-day guarantee, which you can learn more about here:

Happy Gardening!