Our house is newly contructed on an infill lot. Consequently, the city required deep drainage swales on each side of the house to control water runoff. (Our lot has never had a structure on it.) When our fence was installed over the swales, it left a 12-inch gap at the deepest part of the swale.

So...I need a perennial vine that will form a little mini-fence between the ground and the fence. (Picture a D-shaped gap, with the flat part of the D the bottom of the fence.) The fence faces due south, zone 5. The bottom of the swale is almost always moist but not swamped, except after rain, when it can have standing water for a half-day or so. Tall order, I know!!! I considered trumpet vine, but I have a brick house and I'm worried about the vine damaging the mortar. Any ideas?