Answer: Mediland roses are shrub roses, and can be pruned like any shrub rose. Most shrub roses (and species roses) need only a very light trim to shape them a bit and remove dead, shaggy wood. I have heard that Mediland hybrids are quite vigorous, though, so after a few years, yours may need more than a "light trim." As long as the plants are healthy, and lots of new buds are swelling in early spring, you can cut them back quite a bit, in my experience. I had never "formally" pruned roses before this spring, and the shrubs in my rented backyard were out of control. So I cut them back a lot -- and there were lots of blossoms this year!
Think in terms of the final form when you choose your pruning cuts. You don't want them to look too formal, their natural free flowing shape is part of the charm. I believe Mediland hybrids are repeat-flowering, so you should prune in very early spring. You can also deadhead the spent flowers just to make the shrubs look neat if you want.
Sorry it took so long to answer -- happy gardening!
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