I would echo what fignitty said.I have found my 1 year old+trees dropped leaves already,my trees in their first year with more green wood seem to still have theirs,probably because they have been actively growing throughout the season.There also seems to be a varietal difference as well,my Violet Dauphine and BT have retained their leaves dispite being slightly more mature,whilst my White Adriatic,RdB and Precoce de Dalmatie all lost theirs,first to go was the Prococe de Dalmatie,they are all the same age,same location,same pot and mix etc