Hi Annette, I'm one of those that doesn't fertilize peonies, or at least haven't yet! I did buy some azomite and plan to sprinkle it around as soon as most of the ice is gone and I can see bare ground! And Joannabanana's tip (in Ideas) on Epsom salt snagged my attention; I'll probably try that around some of the older plantings. We're in a newer build, added planter's mix to my planting areas before putting anything in so had lots of various composts from the start. I did notice last season that some of the plantings in the back were not looking as vibrant green as before, need to test the soil and possibly amend some, will probably top dress with compost at a minimum.
I also get to plant more this spring, have appx 30 peonies coming and probably 15 roses. Haven't tried roses since moving to this house but was a dismal failure at my last house (killed 6 David Austin roses 1st year). I have high hopes though--I've been haunting the Rose Forum and got specific advice from someone in my area. Now if I can just keep the deer away......
