
Dad used to grow these. You can see why they are called pompom dahlias. He had a whole patch of them in the back garden. I found some in the local garden centre so I have bought a packet of tubers just to see if I can grow them.
The best place to see dahlias in the area is the dahlia walk at the Biddulph Grange garden in Biddulph, Staffordshire. The National Trust owns the house and gardens. The building is only accessible in a few rooms, but the gardens are magnificent. Part classic gardening, part themed garden it is worth visiting and you have to see the Dahlia Walk in late summer. Sections separated by hedges on either side of a central pathway are filled with all sorts of Dahlia plants in all sorts of colours, for example red Bishop of Llandaff ones. Other sections in the garden have various themes, a Swiss cottage next to an Egyptian tomb, grottos and stepping stones and a Chinese temple and giant stone frog and golden calf!
Worth a visit if you are in the area.