Dahlia ‘Edinburgh’ captivates gardeners with its distinct appearance and robust growth. This tuberous-rooted perennial is a popular choice for creating striking visual interest in garden beds and floral arrangements. Its reliable blooms and elegant flair make it a favored specimen.
Unique Characteristics of Dahlia Edinburgh
Dahlia ‘Edinburgh’ is recognized for its formal decorative flower form, featuring lush, full blooms typically 4 to 6 inches (10-15 cm) across. A defining characteristic is its striking bi-coloration, showcasing deep purple or wine-red petals that merge into clear white tips, creating a notable contrast and elegant appearance. The plant generally reaches a height of 36-48 inches (90-120 cm) and spreads about 18-24 inches (30-60 cm), forming a bushy, upright habit with strong, erect stems.
Growing Dahlia Edinburgh
Planting
Plant ‘Dahlia Edinburgh’ tubers in spring after the last frost and when the soil has warmed. They thrive in a warm, sheltered location receiving at least 6 to 8 hours of full sun daily. The soil should be well-drained, fertile, and rich in organic matter to prevent waterlogging. Plant tubers about 4 to 6 inches (10-15 cm) deep, with the ‘eye’ or sprout facing upwards. Space tubers approximately 18-24 inches (45-60 cm) apart for adequate growth and air circulation.
Ongoing Care
Consistent moisture is beneficial for ‘Dahlia Edinburgh’, requiring deep watering a couple of times per week, with increased frequency during dry periods. Water at the base of the plant to avoid wetting the foliage, which helps prevent fungal issues. Fertilization supports strong root development and vibrant blooms; use a low-nitrogen fertilizer (e.g., 5-10-10 or 10-20-20) every 2-3 weeks during the growing season. Avoid excessive nitrogen, which can lead to lush foliage at the expense of flowers.
Staking is often necessary for taller dahlia varieties like ‘Edinburgh’ to support their heavy blooms and prevent stems from breaking. Provide this support as the plants grow, typically when they reach 3-4 feet tall. Regularly removing spent flowers, known as deadheading, encourages the plant to produce more blooms and maintains its appearance from mid-summer until the first frost.
Winterizing and Storing Dahlia Edinburgh
In colder climates, ‘Dahlia Edinburgh’ tubers need to be lifted and stored indoors over winter to protect them from freezing temperatures. Dig up tubers after the first killing frost, when the foliage turns brown and appears dead. After cutting stalks down to about 4 inches, carefully unearth tubers using a pitchfork, taking care not to damage them.
Once dug, gently wash tubers to remove excess soil, ensuring not to puncture their skin, as this can lead to rot during storage. After cleaning, dry or ‘cure’ them for several days in a cool, dark, humid place with good airflow. This curing process toughens their skin for storage. For storage, place tubers in peat moss, vermiculite, or wood shavings in paper bags or cardboard boxes, allowing some air circulation. The storage location should be dark, frost-free, and maintain a consistent temperature between 40-50°F (4-10°C) with approximately 70-90% humidity to prevent shriveling or rot.
Troubleshooting Common Dahlia Issues
Dahlias can encounter several common pests and diseases during their growing season.
Pests
Aphids: Small, soft-bodied insects that cluster on new growth, causing stunted and distorted leaves by sucking plant sap. Manage them by spraying with neem oil, insecticidal soap, or a strong stream of water.
Slugs and Snails: Nocturnal feeders that chew irregular holes in leaves, especially on young plants. Control them with barriers or traps.
Spider Mites: Tiny arachnids thriving in hot, dry conditions, leading to yellow, stippled leaves and fine webbing. Deter them by regularly hosing off plants and increasing humidity.
Diseases
Powdery Mildew: A common fungal disease appearing as white, powdery spots on leaves and stems, particularly in humid environments with poor air circulation. Improve air circulation by removing some lower leaves and avoiding overhead watering to prevent its spread. For severe issues, a baking soda solution can be sprayed on affected areas.