oooh, yours look wonderful!
I'm planning on keeping the plant-pot ratio reasonable by topping or maybe even root-pruning them, or possibly reducing the plant to a single trunk. Which is why I was looking for advice on pruning.
They look like they flower at quite a young age, do they? I'm curious to see if I get flowers at all - what with the shady location and cool climate. I mainly just wanted something tall and architectural for a very small space.