Dahlia ‘Bishop of Oxford’: A Radiant Jewel for Your Garden
Dahlia ‘Bishop of Oxford’ is a striking tuberous-rooted perennial that belongs to the Asteraceae family. Renowned for its radiant coppery-orange flowers and dark purple foliage, this dahlia variety adds a dramatic flair to any garden. Originating from Central and South America, particularly Mexico, dahlias have a rich history and have become beloved garden plants worldwide.
Botanical Background
Scientific Name: Dahlia ‘Bishop of Oxford’
Common Name: Bishop of Oxford Dahlia
Family: Asteraceae
Origin: Central and South America, specifically Mexico, where dahlias are the national flower.
Description
Dahlia ‘Bishop of Oxford’ is a perennial that can reach up to 90 cm (36-40 inches) in height. It features bronze-green, purple-flushed foliage that provides a stunning contrast to its single, orange-red flowers. The flowers, up to 10 cm (4 inches) across, bloom from midsummer until the first frost in the fall. The plant’s dark upright stems support the flowers, which are valuable for attracting bees, butterflies, and hummingbirds.
Foliage: The foliage is dark purple, almost black, and fern-like, enhancing the visual appeal of the bright orange blooms.
Flowers: The single flowers are coppery-orange, with one or two rows of spreading ray florets surrounding a central boss of small tubular disc florets. These blooms are not top-heavy and stand up straight even in the rain.
Growth Habit: Fast-growing and upright, Dahlia ‘Bishop of Oxford’ forms a clump that can spread up to 24 inches wide.
Cultivation and Care for Dahlia ‘Bishop of Oxford’:
Light Requirements: This Dahlia thrives in full sun, requiring at least six hours of direct sunlight per day.
Soil Requirements: It prefers fertile, humus-rich, well-drained soil. The soil should be enriched with organic matter and general-purpose fertilizer for optimal growth.
Watering: Water freely during dry periods to keep the soil consistently moist but not waterlogged.
Planting Instructions: Plant tubers 2 inches deep and 24 inches apart in well-drained soil. Ensure the planting site receives full sun.
Pruning: Pinch out the growing tips to encourage bushy plants. Deadhead regularly to prolong flowering. In autumn, cut back the plant to near ground level before lifting and storing the tubers for winter.
Staking: Due to their height, dahlia plants may require staking to support the stems and prevent them from falling over.
Maintenance: Lift and store the tubers in autumn in zones 3-8 to protect them from frost. In zones 9-10, they can remain in the ground year-round. Tubers should be stored in a cool, dry place and checked periodically for signs of rot.
Propagation of Dahlia ‘Bishop of Oxford’:
By Division: Divide the tubers in spring, ensuring each division has a viable bud. Replant immediately.
By Softwood Cuttings: Take softwood cuttings from new shoots in spring. Plant the cuttings in a suitable growing medium and keep them in a warm, bright location until they establish roots.
Pests and Diseases
Pests: Aphids, leaf miners, glasshouse red spider mites, and slugs are common pests that can affect dahlias. Earwigs, capsid bugs, and caterpillars may also cause damage.
Diseases: Powdery mildew can be problematic in dry conditions, while grey molds and other fungal rots can occur in wet weather. Stored tubers may also suffer from fungal rots. Regular inspection and proper care can help mitigate these issues.
Landscaping Uses
Dahlia ‘Bishop of Oxford’ is versatile and can be used in various garden settings:
- Cottage and Informal Gardens: Its bright blooms add a splash of color to traditional garden designs.
- Patio and Container Plants: Ideal for growing in pots and containers on patios and balconies.
- City and Courtyard Gardens: Adds eye-catching color to urban gardens.
- Wildlife Gardens: Attracts bees, butterflies, and hummingbirds.
- Cut Flowers: The striking flowers are perfect for floral arrangements.
- Flower Borders and Beds: Creates a stunning display when planted in borders and flower beds.
Summary
Dahlia ‘Bishop of Oxford’ is a show-stopping addition to any garden, offering stunning coppery-orange blooms and contrasting dark foliage. Its long flowering season, ease of care, and versatility make it a favorite among gardeners. Whether planted in borders, containers, or wildlife gardens, this dahlia variety brings dramatic color and life to the garden from midsummer to the first frost.
