This photo was not taken yesterday - it was taken 3 weeks ago. My sister who lives close to Harlow Carr Gardens informs me that they have already had a heavy frost and so hopefully the dahlia tubers will now be safely indoors.
Dahlias are invaluable for the summer border, in patio containers or as cut flowers, often flowering until the first frosts. With many excellent recent introductions, they offer a wide range of flower types, often with very showy, double forms in warm vibrant colours. Dahlias are enjoying a much deserved return to popularity.