Posted: 15/02/2016 at 18:36
For me Guernsey, if you develop good strong plants by potting on regularly one dahlia will be enough for that container.,
It's what I do every year. One plant grown well is far better than a packed-in bunch of weedy dahlias. So many presenters are shown stuffing containers like this.
Cannas likewise are squeazed in with other plants.....for me again, one plant that grows several feet and flowers from mid summer