When planting dahlia tubers, it's typically recommended to plant them individually to give them enough space to grow and flourish. Dahlias are known for their expansive root system and large blooms, hence they require a significant amount of space to prevent competition for nutrients and water. A good rule of thumb is to plant the dahlia tubers about 18 to 24 inches apart from each other. This spacing allows each plant to receive adequate sunlight and air circulation, reducing the risk of disease and promoting healthy growth. Therefore, while you can plant multiple tubers in the same garden or flower bed, it is best not to plant them too close together.