Posted: 19/02/2018 at 12:25
The shape of the pot will not influence the way it grows other than, if the pot isn't deep enough for the roots you'll have a very unhappy and stunted plant which doesn't look good and which may be unhealthy and suffer from drought and die.
The Eucalyptus gunnii I can see from here is taller than all the houses around here.
To make them grow bushier you coppice them regularly every year or so like this
However, you'll still need a substantial container to grow it in if you can't plant it in the ground ... something the size of a small skip comes to mind ... I don't think it's a good idea at all.