I bought a pack of mixed perennial seeds last year and so wasn't sure
what I would get. One of the plants is a centranthrus. Before it
flowered I was hoping for a red one, but it turned out to be white.
Its saving grace is its subtle perfume. Very nice.

By the way, these plants seed all over the place (wind blown) - so if
you get one you will end up with loads, but that isn't a problem is
it?