If you're seeking something to add sparkle to your hanging baskets and window boxes, then we would certainly recommend Bacopas. They flower non-stop for months on end, and have the distinct advantage of being self-cleaning, meaning new flowers cover the old and they do not require deadheading to stay looking good. These tender perennials, which originate in Southern Africa, are straightforward and cheap to grow from seed, they are usually treated as half-hardy annuals in the UK but can also be overwintered in a conservatory or other frost free location.