Robert I have twenty or so in ground, the problem with that is in raising them up every year, the roots go down deep deep deep! The alternative is to not raise them and then you don't get the interesting caudex. The other problem is in not understanding that some bloom during different times and as a hedge it doesn't look so good with spotty flowering. You might think about putting some in pots then bury the pot and leave it outside, I did that with one and what light frost we had didn't hurt it and it's much easier to raise it now.
Jim
