For Northerners who garden with annuals, May is always a fraught month. When is it safe for us to plant?
The usual answer is around May 15 or Mother’s Day, when frosts are no longer expected. But even if a frost isn’t in the forecast, temperatures in the 40s can stunt warm-weather annuals. As the Chicago Botanic Garden says on its website, “In May, it pays to be patient and flexible.”