Plant Catalog › Eupatorium coelestinum (Hardy Ageratum) Eupatorium coelestinum (Hardy Ageratum) $0.00 Other Common Name: Blue Mist FlowerBlooms: Late Summer and early FallH: 2-3' W: 2-3'Color: Purple Shades Add To Cart Added! Other Common Name: Blue Mist FlowerBlooms: Late Summer and early FallH: 2-3' W: 2-3'Color: Purple Shades