Lunar Clearwing moth in the garden

While rummaging in the freezer yesterday, I came across a two year old pheromone lure for Lunar Clearwing. More in hope than anticipation, I hung it on the Buddleia bush outside my office window, but nothing came to investigate. Today Linda pointed out not one but three Lunars buzzing around the lure: amazing, since our garden is nowhere near any large trees...