Posted: 28/04/2013 at 21:47
Rowans get big quite quickly. My whip (50cm) this time last year grew to 8ft by autumn last year. I expect it to branch out this year.
Eucatlyptus do grow too large too quickly - 5 years to 20-30ft. The problem is it does grow too quickly and the roots are shallow and in strong winds have a tendancy to fall over. Not good in a small garden as you pick up the damage of a heavy 20ft tree.
Paulowina is a good choice as they grow quickly but you cut them down and they regrow to 6ft every year with large leaves.