I've got irises over Perry, one of the best cats I ever knew, but the other two got trees. The pine over Foo Cat Chu (affectionately known as Foo) has really taken off this year, and he was like our white pine; common as hen's teeth but each an individual. Pine suits him
While it sounds insulting, Mason (Perry's brother
) got a dogwood. Pagoda dogwood is a native around here and with some judicious pruning (my favorite kind) can have a wild but refined form and if you knew Mason, he was a very refined cat, a true ambassador of his species. They're all missed, but all still here, becoming plants so you want it to stay.
I think when it's time for one of the others, I might go with peonies. They are so long lived (as long as people, let alone cats), pretty simple, and while the bloom time can be short, there are not too many better bangs-for-buck blooms like a nice big double peony practically the size of your head busting out an aroma I love for it's complexity. Some of the new singles are nice too; I think 'Bowl of Beauty' is a winner.
I love my lilacs as well, and a perpetual plant with proper pruning. Not a perennial, but nice choice. Which lilac? I like [url=https://www.redbuttegarden.org/files/active/0/%27Krasavitsa%20Moskvy%27.jpg]'Krasavitsa Moskvy'[/url] or [url=https://images.google.com/imgres?imgurl=https://www.dkimages.com/discover/previews/814/50092550.JPG&imgrefurl=https://www.dkimages.com/discover/DKIMAGES/Discover/Home/Plants/Ornamental-Groups/Shrubs/Scrophylariales/Oleaceae/Syringa/Syringa-vulgaris/Syringa-vulgaris-Mme-Lemoine/Syringa-vulgaris-Mme-Lem-2.html&usg=__jCarSmic10XfFV63Io7jfkkmXlA=&h=768&w=517&sz=84&hl=en&start=3&um=1&itbs=1&tbnid=MTKH1y6WmosD6M:&tbnh=142&tbnw=96&prev=/images%3Fq%3D%2527Mme.%2BLemoine%2527%26um%3D1%26hl%3Den%26sa%3DX%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7GGLL_en%26tbs%3Disch:1]'Mme. Lemoine'[/url]