56-63 Days to maturity. Lobularia maritima ’Clear Crystal’. Clear Crystal Alyssum Seeds. Non-GMO, Open-Pollinated, Annual. Open-pollinated seeds. Clear Crystal Alyssum flower seeds grow one of the most fragrant and large-flowered varieties of Alyssum available. These quick-growing flowers are perfect for hanging baskets, and annual ground covers alike. Attractive to many beneficial insects and birds, this low-maintenance beauty is sure to become a regular in your plant rotation. This fleuroselect novelty flower is perfect for bulking out a flower bed in early spring before other bloomers take over. Alyssum seeds are very small, with approximately 60,000 seeds/oz.