In Ruth Rogers Clausen's excellent book, "50 Beautiful Deer-Resistant Plants", a helpful rating scale is provided for each plant. The scale is just 7-10 with plants under 7 not even included in the book, as those plants are regularly browsed by deer. So, 7 is described as "deer sometimes nip off flowers but leave foliage alone", 8 is "deer occasionally nip off one or two flowers but mostly ignore plant", 9 - just browse new spring foliage and 10 - rarely browse and usually avoid plant altogether. Bloom times, and growing and design tips are also included.
So, I was curious if my 2 plants were listed in the book. Forsythia is not even included in the book! The Peony is included in the list of 50 but with a rating of 7-10.
Some plants I didn't realize were deer resistant and I look forward to planting outside the fence include, Blue False Indigo, Yarrow, Castor Oil Plant and Hybrid Sage.