Everything goes into mine; bindweed and horsetail included; I think the more variety the better! All rots down fine. F.C. King recommended including wood in the heap. I could be wrong, but I think he felt it added fungal activity and quality?
Air gaps seem to be key to making a good heap and twigs can help create them. I usually coarsely screen my compost once finished, so any big stuff goes straight into the next heap. Charles is conducting some interesting trials at the moment.
Thanks Rhys and Don.