Manhattan Island Dahlia Plant

The Dinnerplate Dahlia, 'Manhattan Island', produces 10-inch wide flowers that shows off its red blooms and bold hints of yellow in the eye beautifully. It produces multiple blooms throughout the summer to fall. 

Planting Instructions:

• - Plant tubers when soil reaches 60°F. Space them 4-6 inches deep with crown up and roots down

Soil Preparation:

• - Prefers well-drained, fertile soil

Watering Specifics:

• - Wait until green sprouts emerge from the soil before watering
• - Then water deeply 2-3 times per week, and daily if plants are in containers

Fertilizer Type:

• - Use fertilizers with a lower nitrogen count; half the amount of nitrogen relative to phosphorus and potassium (lower N on NPK ratio)
• - Fertilize every 2-3 weeks for containers and every 3-4 weeks for soil grown plants

Pruning and Training:

• - Pinch back the main shoot to encourage branching and more flowers
• - Deadhead spent blooms to encourage continuous flowering

Additional Pest Management:

• - Inspect regularly for pests like aphids, slugs, and snails

Temperature Tolerance:

• - Protect plants from early frosts with mulch or fleece covers to extend the flowering season

Overwintering:

• - After frost has turned the foliage brown, dig up tubers and store them over the winter
• - Clean tubers and let them dry for a few days in a frost-free location, then store in cool, dry place in slightly moist peat moss or sand