63-77 Days to maturity. Lobularia maritima. Rosie O Day Alyssum Seeds. Non-GMO, Open-Pollinated, Annual. Rosie O'Day Alyssum flower seeds grow frost-tolerant and award-winning blooms where other flowers would wither. Rosie O'Day flower seeds mature to tidy 4-9" dwarfed mounding plant with a 12" spread, ideal for indoor gardening or hanging out on the porch or patio. Rosie O'Day Alyssum flower seeds are hardy, easy to grow from seed, and thrive in a variety of cool summer gardens. Rosie O'Day Alyssum debuted as an AAS Bedding Plant Winner for its ease at growing from seed and bright seasonal aroma. Approximately 70,000 seeds/oz.