Here's a 'different' planter. I had an Aloe which just kept growing - I call it my Triffid!
I took two large commercial tree containers, 32 inches diameter, turned one upside down for a base. Put the other one on top , bolted them together through the bottom. Cut some lengths of rough wood ( as used on fence panels. )Screw them on ( screw through them and into the plastic), then a couple of copper bands to finish them off. The planter is 42 inches high.
Behind the wood is a cavity ( the containers form a 'waisted' cavity). The hole half way down is to make this cavity available for nesting ( I got the idea when a Wren nested nearbye).
In the winter I cover the Aloe with polythene and to date it has survived 3 winters. It has an enormous flower spike.
Keith.