I have been agonising over this for a long time. One of the garden "rooms" I want to create is a very formal one with tallish formal hedges and classic statues, water features etc. For the hedge walls I would have ideally liked to use Thuja Plicata, but our climate is way too humid and hot. The Leylandii Cypress would also create the right effect but I need to limit the height to aroung 2 to 2.5 metres and that does not work with this plant. The buxus range are rather too slow growing. I have considered various Lilli Pilli's but we do get light frosts (to -4 or -5) and whereas I used Syzgium Bronzed Aussie elsewhere, a few had problems with the odd 40+ days we had and the tips do burn a little with the frost. Photinia's are a little coarse in the leaves for the effect I want but I know they are hardy. Any other ideas or should I just move to Tasmania instead.