My mom cheated somewhat, she started hers in a container until they got a little too large to worry overmuch about mice. The deer are always an issue here...
After roughly 5 yrs in a container my dad (cursing her ideas all the while) transplanted them into the beds they will be living in...
This last summer was the first in their new home and they did splendidly! If you are concerned about getting them started perhaps using a container at first??