Green Velvet Boxwood

I posted this before, but got no responses. Maybe it's because I mistakenly called them "emerald green" boxwoods, confusing them with the arborvitae I have in pots. Sorry about that. Anyway I got these two "green velvet" boxwoods as tiny shrubs about 4 years ago. I've had them in 18 inch pots. They are now big and I need to know if I have to take them out of the pots. I don't want them to die, so if I have to I will, but I really like them in pots. Can I root prune them (something I've never done before)? Can I just leave them in the pots, or should plant them in the ground? It would be great if anyone has any advice. Thanks.
Em
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Just pop them out of the pots and have a look at the root mass. Is there lots of available space left, or is it a tangled rootbound mess?
Dave

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