(aka: Cacalia atriplicifolia) Arnoglossum atriplicifolium 'Elmore Giant' is a 2021 Plant Delights/JLBG introduction of a giant form of the little-known US (Wisconsin south to Florida) native. Our offering is a 2013 discovery by our taxonomist, Zac Hill in Alabama's Elmore County. The hollow stems, adorned with widely-spaced glaucous maple-shaped leaves, shoot upward in spring at a rate that would make Jack-in-the-beanstalk proud, topping out, including the terminal corymbs of small white flowers in late July at a whopping 9' tall. In the wild 3-6' in height is more typical. Arnoglossum makes a large patch to 5' wide, so allow enough room when you site it in the garden.