Growing ageratum in zone 5a

(Zone 5a = an average winter low of -20°F to -15°F.)

In USDA zone 5a, the typical last spring frost is May 3 and the first fall frost is October 5. Here is when to plant ageratum against those dates.

USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service / Oregon State University PRISM Group. NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020. Planting windows for ageratum from University of Wisconsin-Madison Division of Extension (Wisconsin Horticulture). Zone dates are medians; local conditions vary.