Dahlia Breeding For The Farmer: Everything You Need To Know About Hybridizing New Dahlia Varieties:

As long as you are equipped with the right information, breeding dahlias on your farm or in your garden is incredibly gratifying and not nearly as tricky as you might think. And, of course, it all starts with the tuber!

Dahlia tubers vary in shape and size depending on variety but all have the same three important parts that work together to make a viable tuber: the eyes of the crown, the neck and the body. All three of these elements must be intact and healthy in order to produce a robust plant. The eye is the growing point and is where vegetative growth will begin. The body provides the plant with the nutrition and energy it needs to get the plant going, just as with a seed potato or other kind of tuber. And the neck is what keeps it all together!
In this book, you can fine everything to start dahlia breeding!