This is one of the energizer bunnies of the rose world. It dates from 1817 and was bred in France, though I had also read that it was bred here, in the south. Probably it's simply used a lot in the south. Mine is kept in a pot and brought into the root cellar in the winter; it's hardy only to 6 and not usually grown in cold climates. (Who knows if that's still a factor.)
BN is in bloom from late May through frost. There are tons of buds on each spray always--almost too many. It's a fabulous rose. It's also one of the first roses I planted here.