I have had an olive tree (europea) in a pot for around 10 yrs now. It has always stayed outside. I have a raised bed surrounded on 3 sides by a ramped path. It is close to a deciduous tree (around 6m away) there are no drainage holes through the walls. I was wondering whether I could plant the olive (5' tall with the pot) with a 50/50 mix of john innes no.3 (from previous threads) and some garden compost and added grit (how much?).
It has a load of flowers this year and I feel it wants to do more and would love it to become a bigger tree.
The position is sheltered and sunny, Irises love it there! It gets baked hard in summer.