I've finally been able to get a large, gentle-sloping area prepared by adding 4-6" of rich topsoil over a hard, silty subsoil. I'd like to plant it with an evergreen groundcover. I'm in Victoria -- I think this is Zone 8. I'm worried that it is too late in the season (early Sept) and nothing will have time to become established before the winter rains begin washing my topsoil away. Are there any groundcovers that might have time to take root or should I plant it with something else (suggestions?) for now?