Posted: 12/04/2016 at 16:12
You could but I wouldn't. Dahlias are gross feeders they love lots of food, so a 12 inch pot can only really cope with one plant at a time. Dahlias will put on more and more tubers each year and putting both in one pot means they'll intertwine so you won't know which is which. It may make for an interesting display but I'd keep em separate.