Beryl Jarlov and Auntie June (both daughters of Trevor) took Trevor's ashes in the cannister up to the Twin Kauris, on the road to Whitianga, Coromandel, New Zealand.
Beryl had a posthole digger, one of the type that you twist around and around to dig a small hole. They put the cannister in but did not mark the exact location - just that every time family members pass the Twin Kauris, they say "There's Granddad's grave" or some such.