Manual – Digging up roots of single vines is possible, but discouraged for large infestations since soil disturbance may encourage spread.
Prevention – In order to limit the spread, it is essential to halt the use of Sweet autumn clematis as an ornamental landscape plant and remove it from any existing intentional plantings. Sweet autumn clematis is considered highly invasive and should be eradicated from landscape plantings and controlled in disturbed sites and natural area settings. It readily outcompetes native plants, interrupts native food webs, and reduces wildlife biodiversity. It has been reported as far west as Oklahoma.ĮCOLOGICAL THREAT: This invasive vine has an increasingly wide distribution, is able to grow in a variety of soils, tolerates a variety of light and moisture conditions, and forms dense mats that smother herbaceous plants, small shrubs, and small to medium sized trees. The spread of Sweet autumn clematis is likely underreported and widely spread throughout Indiana, the greater Midwest, and Eastern U.S. HABITAT & DISTRIBUTION: This invasive species adapts to a wide range of conditions and spreads aggressively in open areas, as well as woodland edges, thickets, fence rows, along railroads, roadway and wasteland. Some of our other native clematis species have smooth leaf margins, but the flowers are purplish to pink in color, variously vase shaped, and nodding. In addition, virgin’s bower styles are smooth instead of feathery like Sweet autumn clematis. Unlike Sweet autumn clematis, virgin’s bower, has toothed leaf margins that are shallowly cleft and dentate. LOOK-A-LIKES: Our native virgin’s bower ( Clematis virginiana) is frequent in Indiana. The seed styles are covered in long feathery hairs, enabling wind dispersal. Flowers ripen into clusters of flat oval shaped achenes with long spreading styles. Sweet autumn clematis blooms in late summer into fall.
All parts of the flower are white or cream-colored, and there are no true petals. Flowers are bisexual and each flower as 4 petal-like sepals, many long stamens, and 5-6 pistils. Upper leaf surfaces are green and smooth, lower surfaces are dull light green and the major veins run parallel.įlat panicles of fragrant flowers form along the upper leaf axils. Leaf margins are smooth, and occasionally lobed. Leaflets are ovate to cordate, up to 3 inches long, and as wide as 1.5 inches. While there are no tendrils, the long leaf petioles can wrap around objects or other vegetation to support the vine as it climbs. It has oppositely arranged compound leaves with 3 to 5 leaflets, each with a petiolule (leaflet stem) of varying length at its base. Young stems are smooth and green while older stems are brownish-green to brown. IDENTIFICATION & BIOLOGY: Sweet autumn clematis is a perennial vine in the buttercup (Ranunculaceae) family.
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