Answer: Campsis x tagliabuana 'Madame Galen' is a hybrid between C. radicans and C. grandiflora chinese and is not as aggressive (or cold hardy) as Campsis radicans. Campsis radicans is native to the southeastern and Gulf Coast region of the United States where it grows along fences and at the edge of woodlands. It can be considered invasive because it freely sprouts from underground roots. Your 'Madame Galen' should be well behaved in your garden. Just to make sure, check the ground near your plant for signs of new sprouts. If you find any, pull them up, or dig them up. To further ensure your Campsis won't wander away, you can always line the planting bed, much like you would to contain running bamboo. I don't think this will be necessary, but you certainly could, if you're concerned about it escaping its planting site.
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