Outsidepride Ageratum Mexicanum Blue - 5000 Seeds Ageratum Blue seed grows best in full sun in USDA Zones: 4 - 8. These tall annual flowers make perfect container plants or for edging borders and being fragrant they attract both bees and butterflies. Ageratum Mexicanum Blue grows to a height of 12 inches tall and is perfect for making dried flower arrangements or as a cut flower. Sow these hardy heirloom seeds at 3 -4 seeds per plant and keep moist until germination occurs. Our seeds are always Non-GMO and packaged for the current year.