I second... or is that third
Spring bulbs will push up most mulches, and if they can't push the mulch up, they'll keep trying until they find a way. During the summer last year, I put down some granite cobble stones as decoration and stepping stones in my flower bed. This spring, I had exhausted tulips and daffodils growing from the side of the cobblestone, so I picked it up. They had grown up directly UNDER the stone, grew sideways (very pale under the stone) then found daylight.
I found myself apologizing to those flowers, "Oh my goodness! I'm SO SORRY! I totally forgot you were there!"
In another spot, I'd cardboarded and mulched around some shrubs, forgetting that there were some springs bulbs there. One day in spring, I was coming home, and found myself saying "What IS that?" ...They had LIFTED UP the cardboard.
Yep. Mulch will be NOOO problem.
With perennials, it's a good idea to mulch lightly for now, then heavily once the ground freezes, then move aside some of the mulch in spring after things start to thaw. So make sure to put a GOOD MARKER in the spot. Another way to know where your perennials are supposed to come back up is to NOT cut down the last seasons growth until spring just before or just as new shoots start to grow.
Oh yeah. Putting down cardboard or several layers (4~5) of newspaper or newspring/craft shipping paper first is a good way to smother and prevent perennial weeds from re-emerging next spring. You can cut X's in the paper to plant bulbs and plants or plant then lay the paper around them and mulch on top. Put down any soil amendments (I usually spread a layer of compost) and make sure to water well before papering and mulching. For bulbs, I add some Compost+Rock Phosphate (some people use Bonemeal or BulbTone) in the bottom of each hole and mix with soil before dropping the bulb in.