@Marilyn, I agree, working with clay soil is such a pain. The WP Milner will be going in my new peony bed, along with T. Akebono. I will plant WPM strategically to protect the tulips, and around the lilies that I have planted in this bed.
I like to plant smaller daffs around my tulips. Last fall I planted N. Little Gem at the edge of my bed that had the Red Hot Tulip mix, and in 2012, I planted 250 N. Hawera in and around my beds with my lilies. I noticed not as much critter damage in those beds since I've done that.
I like N. Hawera, it has thin leaves that doesn't over power the plants I use it to protect, and it's also fragrant,
BTW, I love, love, love the Parrot tulips. I've planted them in the fall for several years now. I haven't noticed that previously planted ones have ever returned😔