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Dahlias belong to the tuber plants. The older the dahlias are, the more tubers they have and the more the same plant will appear. Since dahlias are not hardy and therefore have to be dug out in the fall for the winter, you can see at first glance how big the tubers have become.
The bigger, the bushier the single plant becomes. However, if there are too many tubers, then you also do something good for the plant if you divide it. Thus one saves oneself the purchase of new tubers and can its dahlias even multiply.
Divide dahlia in spring before putting it in the ground. You can either simply pull the tubers apart. If these are grown together too tightly, you can also cut off the tubers with a knife.
Disinfect interfaces with charcoal powder
Make sure that the interfaces, ie the wounds, are kept as small as possible. If you want to play it safe, you can disinfect it with charcoal powder.
Pay attention to individual shoots
Also, you should make sure that always one, better two or three pieces of fuel per tuber are available. This is easily recognizable as they can already be seen in spring.
Plant the split dahlia tubers again and enjoy ever-larger flowers. Because already two or three years later can be shared again.