Is it possible to grow an Acacia variety in Ohio (zone 6)? I'd prefer to not grow them in a greenhouse, I'm looking for something that will survive the winter (even if I cover it all winter).
The hardiness of a plant is influenced by many factors some of which you can influence.
your local micro climate:
- sheltered is good - warmer urban areas help - ideal soil conditions. - Acacias do not seem to withstand heavy snow loads so plant accordingly.
- Although the hardiest acacias I could find were good to zone 7 ish the latest USDA zone map shows a creep of warmer winter temperatures northward. I'm certainly seeing this where I live.
You could try these species:
- Acacia obliquinervia good to at least -12 deg F 2 deg C
- Acacia pravissima cultivated in Europe for many years
I would try growing plants from seed rather than buying established plants and plant as many as your garden will fit.