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USDA Plant Hardiness Zones

To help gardeners understand which plants will grow well for them, the entire USA has been segmented into ‘Plant Hardiness Zones’. Knowing your zone number is helpful when shopping for plants because:

  • Cold-area gardeners can avoid buying plants that simply won’t survive their lowest winter temperatures.
  • Warm-area gardeners can steer clear of plants that need a period of cold weather in order to bloom again.
Find your Plant Hardiness Zone here.

Blue Star Flower Hubrichtii

 
Blue Star Flower Hubrichtii, Amsonia Hubrichtii, Blue Star Flower or Arkansas Blue Star Flower View Larger Image

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Hubrichtii is the perennial of the year for 2011. Pale blue star shaped flowers appear is late spring to early summer over fine, feathery foliage. Excellent golden yellow fall color. (Amsonia)

Zones 4 - 9
Advantages
Deer Resistant
Deer Resistant
Light Requirements
Full Sun
Full Sun
Half Sun / Half Shade
Half Sun / Half Shade
Mature Plant Size 30-36" tall, 24-36" wide
Bloom Time Late spring to early summer
Size Plant - 2.5" pot
SKU 2AMS

Plant Information

At a height of 30 to 36", Amsonia hubrichtii looks best as a backdrop for shorter perennials. Its designation as the Perennial Plant of the Year for 2011 indicates that it's not only attractive, but also adaptable and easy to grow in a variety of garden situations. The tall stems sport feathery foliage and are topped in late spring or early summer by pale blue, star-shaped flowers. In fall, the foliage turns a brilliant yellow. The plant prefers full sun to part shade and moist, rich soil. Cut stems back by about a third after flowering to prevent flopping, a common occurrence if planted in too shady a spot.
SKU 2AMS
Common Name Blue Star Flower or Arkansas Blue Star Flower
Botanical Name Amsonia Hubrichtii
Zones 4, 5, 6, 7, 8, 9
Light Requirements Full Sun, Half Sun / Half Shade
Flower Color Blue
Mature Height 30-36" tall
Estimated Mature Spread 24-36" wide
Bloom Time Late spring to early summer
Planting Depth Crown of plant should rest just at or above the soil surface after watering in.
Ships As Potted Plant
Planting Time Spring / Summer
Soil Type Loamy Soil
Soil Moisture Average, Well Draining
Advantages Deer Resistant
Neonicotinoid-Free Yes - Learn More
Ships to Hawaii, Alaska & Canada No

Shipping

Most orders ship within 48 hours or less.

As soon as your order is placed you will receive a confirmation email. You will receive a second email the day your order ships telling you how it has been sent. Some perennials are shipped as potted plants, some as perennial roots packed in peat.  The ‘Plant Information’ section describes how that item will ship. All perennials and spring-planted bulbs are packaged to withstand shipping and are fully-guaranteed. Please open upon receipt and follow the instructions included.

Perennials and spring-planted bulbs are shipped at the proper planting time for your hardiness zone. Perennial and spring-planted bulb orders will arrive separately from seeds. If your order requires more than one shipment, there is no additional shipping charge. See our shipping information page for approximate ship dates and more detailed information. If you need express shipping or have any questions, please call Customer Service toll-free at (877) 309-7333 or contact us by email.

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Q & A

Plant With These:

USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

Find Your Planting Zone:

Enter your Zip Code to find your USDA Planting Zone

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