Yeah treated pine i use the 1800mm X 150mm X 17mm you can get 12mm thick but 17 much better im slowly changing all my trees that are in the white foam boxes into these. They look great last a very long time an can be made to any size you want, my sisters hubby has had 2 olives in ones he made about 10yrs old they are now an the grow boxes doing fine.
I dont line them but do put a layer of gravel on the bottom
Just been letting this tree grow for a bit will be repotting it in late march when its still warm but not stinking hot should settle in before winter ready for spring growing, has worked in the past. Picture below was taken yesterday
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Im new to the forum and love Olive also. very inspired by your big tree here.
Only just today I came across some recently cut down olives by the local council in Tea Tree Gully and
ended up grabing a stump 600mm wide at the base and about 1 metre tall.(didn't even have to dig, just walked up to it and threw it in the boot!!!)
its been chain-sawed right at the ground level and still green. should I put this stump in coarse sand and let it root? what process did you use to develop roots at the base of the stump. any help would be greatly appreciated. I should start my own thread with pics for ya to see.