Both trailing and spreading, this work horse can be planted in cool weather but continues to perform late into the summer. Hundreds of tiny blossoms with light green narrow leaves cover low mounding plants. Great in gardens and containers. Fragrant flowers attract bees and butterflies. Few annual plants can match the heat and drought hardiness of sweet alyssum. The flowering plant has naturalized in the United States and thrives in a wide range of regions. Sweet alyssum flowers are so named for their lively fragrance and are members of the mustard family.