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Sweet autumn clematis (Clematis terniflora) is the star of my September garden. I planted it on the east side of the pergola that covers our brick patio, and it's taken a couple of years to attain enough height to provide shade. By next year I expect it will reach the pergola top. When the vine explodes into bloom in late summer and early autumn, it is entirely covered in small, fragrant stars. Heavenly.
A perusal of literature about sweet autumn clematis reveals mostly accolades about this extremely hardy, healthy vine. That being said, there are some negative reports. According to my favorite online source for plant info, www.davesgarden.com, all parts of sweet autumn clematis are poisonous if ingested, and some people experience allergic skin reactions to it. Others experience hay fever from its pollen. I've not had any trouble with it, and I tie wayward vines to the trellis without gloves. No sneezing either.
Apparently, the vine is considered a non-native invasive, as well. I might not have planted it had I known that fact. However, I have never seen seedlings in my yard, garden or flower beds. And while I am sure it would be happy to ramble over a nearby redbud tree, I simply train those tendrils to their arbor.
As far as care goes, I let nature take its course. I never watered or fertilized it during this entire season of drought, and it survived unscathed. I have not pruned it. Some recommend pruning back hard in early spring, but I let it go, and new growth eventually sprouts from the previous year's vines--all the way out to the very tips. I think it's best to simply consider the size and scope of this vine, and let it grow as it will. It will reach 20-30 feet in height, which is perfect for a big pergola or privacy fence, but not for a wee arbor. You'll want to make sure whatever structure you train it to is sturdy enough to support it.
Although the reviews of the sweet autumn clematis are mixed, for me it is a gem worth growing. Sweet Autumn Clematis photos by JulenaJo.