60% pine bark? I think that is far too much for an olive in your climate. What is your winter protection plan for this tree if I might ask??
Well what I plan on doing is putting it by a window near a heat vent (probably pull the table out 3-4 feet so it is not right against the glass).
And what I ended up with is some bark mulch (it is still fairly large, gonna throw it in the food processor to break it down a bit) for orchids. and a bit of red lava pebble (small, around 1/8th inch) and some crushed red granite with fines
This does not sound very pretty.
This on the other hand sounds very pretty.