Plant spacing is based on the ultimate width of the plants. This figure is normally given as a range; for example, 3-5’. If you live in a cold climate and/or want plants to fill in more quickly, plan to space at the shorter end of the range. If you live in a warm climate, are on a limited budget, or are willing to wait longer for plants to touch, use the higher end of the range. Using the larger number is recommended when calculating distance from a building or structure. There’s really no such thing as "maximum spacing": if you don’t want your plants to touch, you can space them as far apart as you’d like. All plant spacing is calculated on center, or in other words, the centers of the plants are spaced one half of their eventual width apart:
Unless you are planting in a straight line, as you might for hedges or edging, space your plants in a staggered or zig-zag pattern for a more interesting and naturalistic look:
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DescriptionAs a native perennial with textured foliage, stunning flowers, and rock-solid dependability, 'String Theory' bluestar (Amsonia) checks all of our boxes. It blooms in spring with delicate periwinkle-blue clusters of flowers, which serve as an important nectar source for pollinators. Even after the flower fade, this perennial never seems to blend into the background. Instead, its bushy and fine-textured habit is prominent in the landscape, especially when the foliage takes on brilliant golden fall colors.
This perennial is easy to grow, deer resistant, tolerant of heat and humidity, and perfect for gardeners of any level.
Compared to the popular 'Storm Cloud' bluestar, 'String Theory' is more compact and boasts thinner needle-like leaves.DetailsBotanical name: Amsonia 'String Theory' Common name: bluestar, threadleaf bluestar Zone: 4 - 9 Sun exposure: Sun (6+ hours sun) to part sun (4-6 hours sun) Height x width: 22" x 36" Flower color: Blue Foliage color: Green Season of interest: Late winter and early spring Uses: Edging, flower gardens, wildlife gardens, native plant gardens, landscaping How To GrowSoil: Thrives in most soils. Light: Flowers best in full sun (> 6 hours sun) but will tolerate part sun (4-6 hours sun) as well. Water: Average moisture is ideal and will tolerate dry and wet conditions. Spacing: 2 to 3 feet Fertilizing: Not required, but if desired, fertilize with an all-purpose garden fertilizer in spring. Winterizing: No special winter requirements. Maintenance & pruning: This plant has a naturally petite habit, so pruning is not necessary. However, if you desire a more uniform shape, you can prune just after it’s done flowering.
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.
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