Also known as Ageratum, this native to Mexico and adjacent Central America was discovered by William Houston (c. 1695-1733), a Scottish botanist, plant collector, and ship’s surgeon. Houston sent seeds to England in the early 18th century, and British author Philip Miller referenced the species in a 1768 edition of his Gardener’s Dictionary. It was first documented in American gardens in 1836. This self-seeding species forms a spreading, loose-growing plant. The pale blue, and occasionally white, tassel-like flowers bloom from midsummer until the first autumn frost.The Ageratum at Monticello is tall-growing and is not to be confused with the dwarf bedding types now popular.

Visit Monticello’s Online Shop to check for seeds or plants of Ageratum.

Typical Blooming Dates: July - November
Growth Type: Annual
Blossom Color(s): Purple, Blue, Pink, White
Location at Monticello: West Lawn
Planting Conditions: Partial Shade