Q.regarding four O’clocks
I bought some variety that does not have a fragrance but was wondering, as I live in southern Ontario (in the GTA ) Mississauga, what is the coldest temperature that these beautiful plants can tolerate? Do I need to dig the roots up and bring them in for overwintering or can I leave them in the garden for next year? I do realize that it gets down to -29-30 in winter, but usually around -25. Again, thank you!
In your zone, they would not survive the winter, and as they are annuals, but you can dig the roots and store, then plant in the spring. You can also gather seeds from yours, and store them over the winter, then sow them in the spring when all chance of frost is past. This article should help you out. http://www.craftygardener.ca/four-oclocks/