Growing wax begonia in zone 3b

(Zone 3b = an average winter low of -35°F to -30°F.)

In USDA zone 3b, the typical last spring frost is May 17 and the first fall frost is September 23. Here is when to plant wax begonia 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 wax begonia from Clemson Cooperative Extension, Home & Garden Information Center. Zone dates are medians; local conditions vary.