Dahlia Garden in Full Bloom

Dahlias came to European gardens from Mexico, where they are the national flower. They grow from tubers, so in cold places gardeners lift them every fall and keep them somewhere frost free until spring. This dahlia jigsaw puzzle walks down a gravel path between beds in full late summer bloom. Breeders have named tens of thousands of varieties, from flowers the size of a button to blooms as wide as a dinner plate.