Mona is right about describing our summer weather. In recent years, Southern Ontario has been besieged by very hot and dry summer weather. The milkweed is usually spent by late July or early Aug. This summer has been much cooler, with more days of overcast skies. Many of the milkweed plants in my region are still viable, and as of Sept 8, I am still collecting cats. This may result in a larger local population.