thanks to all!
Your responses have given me some better ideas!
The first load was more shredded than chipped with lots of loose twigs and green leaves.
These most recent loads are woodier, no leaves and around 1"chips with a good amount of sawdust.
We generally get a lot of rain over the winter so I think adding layers gradually as they get soaked might be best.
I don't want to have to add edges to beds or fruit tree rings so letting the layers compact might help keep in place...I hope.
...and winecaps in the spring Eric