Old Ma Nature gives you Canucks a break. I've planted them as late as late June and had good results. The ones I planted on the 4th of July last year began to sprout, but ended up returning to the earth about a month later. We did have a pretty hot July last year. Actually, prime time for planting is now. but you can have good success getting them established through June. You just probably won't have a whole lot of growth during the establishment year but they'll take off like rockets the next year. Give it a go. Aey!