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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 compact version of the industry standard Amsonia hubrichtii. The compact habit is covered with light periwinkle blue flowers in late spring, flowering later than 'Storm Cloud'. While other Amsonia can often display chlorotic leaves, 'String Theory' displays healthy dark green leaves throughout the summer. We have observed the same brilliant golden orange fall color as you would expect from A. hubrichtii.

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


Amsonia thrives in most gardens with little care. It is low-maintenance, easy to grow and trouble-free. Plant it in full sun or partial shade and moist soil of average fertility. If grown in too much shade or very rich soil, its habit will be open and floppy. This plant grows fairly large but it will not need to be divided for many years. Cutting the stems back to within 6-8" of the ground after flowering will result in fuller growth.


From Walters Gardens website

Amsonia 'String Theory'

SKU: 6256218893861
  • Common Name Blue Star
    Plant Type Perennial
    Zone 4-9
    Height 18-22"
    Spacing 32-36"
    Growth Habit Uprignt
    Growth Rate Medium
    Bloom Time

    Late Spring

    Early Summer


    Full Sun (>6 hrs. Direct Sun)

    Part Shade (4-6 hrs. Direct Sun)

    Water Needs

    Average Water Needs

    Consistent Water Needs

    Soil Type

    Poor Soil Quality

    Average Soil Quality

    Fertile Soil Quality

    Deer Resistant

    Border Plant

    Cut Flower

    Cut Foliage

    Easy To Grow

    Attractive Foliage

    Mass Planting

    Focal Point

    Origin Native to North America
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