I got tired of having to remulch it every year so I used lava rock this year instead but now my roses don't seem to be blooming anymore.
I know that I have a rose bush right outside my laundry room door and it has lava rocks all around it, and it makes roses like crazy!! So I can tell you that it definitely should not matter at all.
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I wouldn't think that would matter, as long as the roses can still get all the water they need. It's possible they need fertilizer, of course. The only other thing I can think of (presuming the plants themselves are healthy) is that they were pruned at the wrong time and the portions of the canes that would have produced buds were removed.
Could be too hot or dry . Otherwise , I'd think they'd do well , because of the drier conditions (less , or no disease) .
