Ageratina havanensis,  also known as  Eupatorium havanense, usually blooms in October and November, but this year it is blooming in May. Most plants don’t have two scientific names, but the one common thing about this small perennial is that it has several common names: Shrubby Boneset, White Mistflower, Thoroughwort, and Havana Snakeroot to name most of them. In other locations I’ve observed it in October or November, it has been covered with a variety of butterflies, but not so in my yard at this time of year. One wonders why…