All Euphorbias have a milky sap.. and that includes Poinsettias.. Never rub your eyes when working around them.
Other good perennial companions for me are:
Nepeta fassenii and mussonii
Achillea 'Moonshine'
Achillea kelleri
because the foliage and flowers on TB's are both large, I like smaller textures with them.. finely textured grasses, succulents like Echeveria, annuals like violas. Calendulas, California poppies, delphiniums, roses, clematis are also blooming along with the Iris here.. Of course, what works in your climate, may be different than mine. I was disappointed to find that the Lupines that look so glorious at Schreiners bloom a month after the Iris here.
