Glad to help. Just remember to amend, amend! amend! that heavy clay with as much leafy compost-y stuff as you can before you plant, then also mulch those babies deeply for the winter.
Being planted this late, they won't have much chance to put roots down and that makes them a little more vulnerable to cold. The mulch will help stabilize the soil temperature (prevents freezing and thawing which causes the ground to "heave" ) as well as keep the moisture level up.
Another method to over-winter would be to dig a hole and bury the pots (the ones that they are in now, not the giant ones
) and mulch deeply over the whole thing. Then in spring if you still want them in the giant pots, they'd be easy to transplant and not rooted into that blasted clay.
