Unity tree shadow not showing

Hi, I'm light mapping a terrain with a Unity tree on it but it's only showing the trunk and branch shadow not the foliage, I have the tree and all it's parts marked as static, and set to cast and receive shadows, anyone know why this would happen?

My light map settings are

Mode : Single Light maps Qualaty : Hight Resolution Quality : 30

All other object in the scene cast and receive shadows fine.