Posted: 14/01/2016 at 13:23
I use Halls of Heddon too. Their display gardens aren't far away from me, ie near Newcastle upon Tyne.
I grow dahlias every year, A couple of years ago I started a new rose border semi under planted with lower growing dahlias. To my mind it wasn't a god idea. I've found that dahlias flower much better when dead headed not a pleasant task when dodging rose thorns.