And a larger specimen, less than ten years old and already 4-5m tall, in the garden I look after in Kew. Unworried by recent cold spells, hard frost and snow - even the prolonged minus-zero that was March 2013. Urban heat island effect.... http://www.telegraph.co.uk/gardening/howtogrow/3346137/Mimosa-How-to-grow.html http://www.rhs.org.uk/Gardens/Rosemoor/About-Rosemoor/Plant-of-the-month/January/Acacia-dealbata