I have some about thirty years old that are about four feet high.
When I first planted them I had no idea they would get that large.
I'm deciding now whether to prune them back or move them further from the walkway. I'm favoring the latter.
Mike

5'x5' is maybe a bit generous but the plants can easily get to 4' tall and spread a lot.......6' is common in my area. Exactly how big they might expect to grow would depend on your location - in the PNW, virtually all rhodies and azaleas will achieve maximum sizing if grown to their liking :-))

Here is a real Hino Crimson mess! I let it grow here much too long. Now it's time to move em' and clear this area out so I can see what to do with it. Way too crowded now.
I like plants growing together as opposed to a collection of individuals as is most commonly seen, but this is a bit too much.
BTW Gardengal48, do you know the difference between Hino crimson and Hino degiri? (sp?) I sure don't.