Browallias are profuse-flowering South American relatives of Petunias. One of the annual species, Browallia americana, is a bushy plant that will fill the gaps in your garden with bright, true-blue flowers dotted by striking white eyes. Plants grow about 24 inches tall. An annual here in Litchfield, CT, but self sows in warm climates.
Browallia is a very useful replacement in spots where spring bulbs have gone by. We use it as a summer replacement for spring Tulips in our Long Border at the nursery in Connecticut. Browallia is always one of the most requested plants in that border, probably for a couple of reasons: it's unfamiliar, so visitors want to know what it is; and its lovely blue color complements almost any other color you can name.