Why are the leaves on my dahlias yellow?Updated 19 days ago

Towards late autumn your Dahlias will start to die back in preparation for winter dormancy. The leaves and stems will naturally begin to turn yellow and can be trimmed away when you lift the tubers for overwintering. However if you notice the leaves turning yellow during the summer months, this may suggest a nutrient deficiency, indicating that they would benefit from a feed or growing conditions with deeper, better quality soil.