I recently (mid/late August) purchased three cultivars for my new hosta bed: Twilight, Paradigm and June. I believe that the Twilight and Paradigm are mature divisions...they are huge compared to the June, which are approx. 6-7" high by 6-7" wide.
Like many in the Northern US, we are currently transitioning from fall to winter. My Twilight and Paradigm have gone dormant, but to my surprise the June still look great! They look identical to how they did in August, despite having been through a couple of frosts.
Thank you for the earlier posts and subsequent feedback involving June; they were key in my decision to purchase the cultivar. I am looking forward to Spring 2011!