I have about 24 peonies that were left by the previous owner of our house. I love seeing those spears poking up from the ground, and cutting huge bouquets to bring indoors! The ants like to hitchhike on the opened blooms, too, so my husband isn't as fond of them inside.
I've often wondered if I should be fertilizing or doing something else for them, but they've just been happily blooming along with no real interference from me! I've added beds in front of them, to make them the back border, and they've seemed happy enough to have all the company.