Alyssum, Sweet (Lobularia maritima) Fragrant, small-petaled blossoms on compact plants 2 to 6 inches tall. White, rose, and blue. Varieties: Rosie O'Day, Violet Queen, Royal Carpet, Carpet of Snow, Sweet. Soil and Light Full sun. Will tolerate some shade. Tolerant of all soil conditions. Planting Sow seed outdoors as soon as ground can be worked, or buy transplants. Often self-sows. Comments Use for edgings, borders, rock gardens, hanging baskets, and window boxes. In warm climates, will bloom all year. Trim to encourage new growth.