I did not even know to cut foliage down, so I just left it for the past 3 years and it has been mulch for the peony. I suppose it might build up and bury the peony, except the ducks dig under the mulch. I will cut it down this year, just because that one has Peony Spot badly, but again, I just thought that was what peonies looked like as summer progressed. Don't know what I 'll do with the foliage yet, I'll decide at the time since we are rural and I have several good options.
