Eupatorium capillifolium aka Dog Fennel

Eupatorium capillifolium, also known as dogfennel or dog fennel, is a North American perennial herbaceous plant in the Asteraceae family. It is native to the eastern and south-central regions of the United States. This upright plant can reach heights between 50 cm and 2 meters, with multiple stems branching out from a sturdy base. The stems and base are adorned with leaves that are so finely divided, they resemble branching green threads in intricate fractal patterns. However, when crushed, the leaves and flowers emit an unpleasant odor. The leaves of Eupatorium capillifolium are bright green and intricately divided, with each leaf division measuring less than 1mm in width. The flowers, which are dull pinkish-white and relatively insignificant, may not even have a chance to bloom before frost cuts the plant back. Despite this, Eupatorium species, including E. capillifolium, are grown as ornamental plants, particularly in Asia. These perennials produce long-lasting flowerheads that range in color from purple to white. While they can bloom from late spring, their main blooming period occurs in late summer. The tall stems and vibrant blooms attract butterflies and bees, making them a delightful addition to any garden. One notable American species is E. maculatum Atropurpureum Group AGM, commonly known as Joe-Pye weed, which can grow taller than 2m. Another variety, E. capillifolium 'Elegant Feather', reaches a height of 1.5m and features feathery foliage that turns reddish brown as the season progresses. However, this particular variety usually does not produce significant flowers during its blooming phase.