Green acorns arent mature. Deer still eat em just fine but I dont recall ever seeing a tree with green acorns under it that was anywhere as hot as a tree once it is into its natural drop of mature acorns. I dont really think really preference between trees is seen until mature acorns are dropping from lots of trees. I could definitely be wrong on that though. My take is when deer are hitting green acorns, they are just getting what is available because wind, birds, skwerls etc. knocked some out.Can you tell me more about what it tells you if the acorns are green or brown? Does it indicate timing alone or deer preference too?