A small delight, violas bloom during the first balmy days of spring, just when gardeners are getting down to planting. Many have expressive faces and whiskers of dark tracery across the velvet petals in almost every imaginable color and shade. They look great in containers, planted about the vegetable garden for their edible petals, or at the garden's edge, where many self-sow for a yearly spring treat. They dislike hot summer weather—during this time trim back and they will rebloom in fall.