Horticultural Highlight: Amsonia hubrichtii, Thread-leaf blue star
…Yellow, yellow, yellow
it eats into the leaves,
smears with saffron…
-William Carlos Williams
Autumn at Mount Auburn is full with an impressionistic cornucopia of changing landscape colors. During this weeks-long period, different plants pass the mantle of being the “plant of the day.” One plant providing outstanding yellow is Amsonia hubrichtii, thread-leaf blue star.
The genus Amsonia includes about 20 species of clump-forming, herbaceous perennials, primarily native to North America, with one species each also native to eastern Asia and Europe. The name commemorates John Amson (1698-1765), English physician and botanist, who was the one-time mayor (ca.1750) of Williamsburg in Colonial Virginia.
Amsonia hubrichtii, thread-leaf blue star in May displays pale blue flowers atop of three-foot-high stems. Its leaves are uniquely narrow, finely textured, adding contrast next to any companion plants. In breezes, there are kinetic, delightful sways of this billowy foliage. October provides further grandeur as these leaves slowly morph into a butter-yellow or vibrant gold color that will persist for 2-3 weeks. This was the Perennial Plant Association’s “Plant of the Year” in 2011.
We also grow Amsonia tabernaemontana var. salicifolia, blue star that likewise produces blue springtime flowers and outstanding yellow fall foliage. The lanceolate, willow-like leaves are wider than thread-leaf. These two stars are problem free, three-season, reliable perennials. On your next visit to Mount Auburn look for these on Central Avenue, Narcissus Path, at the flagpole and in Asa Gray garden among other locations.
…Yellow as a goat’s wise and wicked eyes,
yellow as a hill of daffodils,
yellow as dandelions by the highway,
yellow as butter and egg yolks,
yellow as a school bus stopping you,
yellow as a slicker in a downpour…