Tall, upright, sturdy stems. Tight blue flower clusters. Use as a classic filler for mixed bouquets or plant to attract bees and butterflies to your garden. Ageratum is also known as floss-flower or blue mink. Average height is 24 to 30 inches. Blooms in about 100 days. Germination rate about 80% or better. David’s Garden Seeds is a Veteran owned business that has been offering quality seeds since 2009.