Dahlias are invaluable for the summer border, in patio containers or as cut flowers, often flowering until the first frosts. Keep picking them and one dahlia tuber will produce hundreds of flowers. Soil requirement: Any garden soil with a good supply of organic matter. Increase organic matter by adding farmyard manure or garden compost to your soil. Digging the soil before planting is recommended. Keep plants well watered during growth and remove faded flowers. Pinch out growing tips once plants reach a height of 40 cm/16 inch to encourage branching. Height: 40\"/100cm