Growing french sorrel in zone 5b

(Zone 5b = an average winter low of -15°F to -10°F.)

In USDA zone 5b, the typical last spring frost is May 1 and the first fall frost is October 10. Here is when to plant french sorrel 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 french sorrel from University of Illinois Extension. Zone dates are medians; local conditions vary.