Sweet Alyssum
Sweet Alyssum, a hardy annual plant native to Mediterranean Europe. It usually grows from 4 to 12 inches (10 to 30 cm) high, with branching, leafy stems and clusters of tiny, fragrant white or violet flowers. The plant is usually grown from seed, indoors or out. It is often used as edging for gardens but may be raised in window boxes, shady places, or rock gardens.
Sweet alyssum is Lobularia maritima of the mustard family, Cruciferae.