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These look so small and cute compared to what I had seen in England. This is a plant that is not in my zone..

These are young plants and perennials are only just waking up in this country, they will grow into giants sooner or later. The huge ones you have seen in the UK started out this small. What zone are you in? These are in 3ft half barrels and I'm sure you could do the same where you are. If it is cold, cover them with their own leaves and horticultural fleece overwinter and if it is hot, make sure they are well watered ans in a semi-shady spot during the hottest parts of the day.