Expert's choice Dahlias

For a long-flowering range of colourful blooms that last until the first frosts, collerette dahlias will do nicely

- says Graham Rice

How many dahlias do you grow - two? Two dozen? Fancy a change, like to try something new? Well, over the last four years more than 200 new dahlia varieties have come on the market. 200! That's a lot of dahlias. You'll see the 'New' flashes on the specialist websites and catalogues. But which to try? With so many newcomers on the scene we need help to narrow t