Dahlias come in a huge range of shapes and sizes, from dwarf collarettes to spiky cactus, dinner plate, pom pom, waterlily and anemone-flowered varieties, all of which have their own charm.

Spring is just around the corner, and if you're wondering when to plant dahlias in pots, the wait is almost over. Knowing when you should plant dahlias directly into the ground is one thing, but ...