The listing, White Alyssum has ended.
Although treated as an annual in the North, sweet alyssum is one of the hardier annuals there: it may survive light frosts that tenderer plants will succumb to. Sweet alyssum flowers do come in other colors (there is a purple alyssum, for instance), but white alyssum is the most widely planted. Its flower clusters are fragrant. The flowers have 4 small, blunt petals set in such a way as to give the blossom almost a squarish appearance. Sweet alyssum plants are short and spread to form mats. The plants' narrow leaves hardly show at all when sweet alyssum is in full bloom, if the plants are packed tightly together.