Dahlias are popular garden plants, celebrated for their diverse forms and vibrant colors. The ‘Red Runner’ dahlia stands out as a striking choice for gardeners seeking a bold and unique addition to their outdoor spaces. Its rich, deep red blooms offer a captivating display that can transform a landscape, drawing attention with their intense hue and elegant structure.
Understanding Red Runner Dahlias
The ‘Red Runner’ dahlia is a formal decorative variety, distinguished by its strong, upright stems and crimson red blooms. The term “runner” refers to the vigor and robust growth habit of this dahlia series, known for producing abundant flowers on sturdy stems. Its blooms measure between 4 to 6 inches (10-15 cm) in diameter, featuring fully double flowers with rounded petals.
These dahlias can reach a mature height of 3 to 4 feet (90-120 cm), making them suitable for garden borders or as impressive cut flowers. Their deep scarlet red color creates a striking contrast against green foliage, making them a captivating element in garden designs. Sturdy stems ensure large blooms are well-supported, minimizing the need for extensive staking compared to some other dahlia varieties.
Planting Red Runner Dahlias
‘Red Runner’ dahlia tubers should be planted after the last spring frost, when the soil temperature consistently reaches about 60°F (15°C). Choosing a location that receives full sun, ideally 6 to 8 hours daily, is important for optimal growth and flowering. While full sun is preferred, some afternoon shade can be beneficial in hotter climates.
‘Red Runner’ dahlias thrive in well-drained, rich, organic soil with a pH between 6.5 and 7.0. Before planting, loosen the soil to a depth of at least 12 inches (30 cm) and incorporate compost or other organic matter to improve drainage and fertility. Plant tubers about 4 to 6 inches (10-15 cm) deep, placing them horizontally with the eye or sprout facing upwards. After covering the tubers with soil, press it firmly to remove air pockets and water thoroughly.
Caring for Red Runner Dahlias
Once planted, ‘Red Runner’ dahlias require consistent care. Initial watering should be thorough after planting, but subsequent watering should be reduced until sprouts emerge to prevent tuber rot. After establishment, deep watering once or twice a week is sufficient, allowing the top inch (2.5 cm) of soil to dry between waterings. Avoiding overhead watering helps keep foliage dry, which can deter disease.
Fertilization is beneficial, with a low-nitrogen granular fertilizer (such as 5-10-10) applied about 30 days after planting and then monthly. Over-fertilizing, especially with high-nitrogen products, can promote leafy growth at the expense of blooms. Deadheading, the removal of spent flowers, encourages the plant to produce more blooms rather than setting seed. For taller varieties like ‘Red Runner,’ providing support with stakes early in the season can prevent stems from bending or breaking under the weight of their large blooms.
Winter Care for Red Runner Dahlias
In regions where winter temperatures drop below freezing (USDA Zones 7 and below), ‘Red Runner’ dahlia tubers need to be dug up and stored indoors to protect them from frost. The ideal time to dig tubers is after the first hard frost has blackened the foliage, signaling that the plant has entered dormancy. Wait about 10 to 14 days after the foliage dies back before digging, allowing the tubers to cure and store energy for the next season.
When digging, carefully loosen the soil around the plant to avoid damaging the tubers. After lifting, gently remove excess soil, rinse the tubers with water, and allow them to dry for several days in a cool, dark, and well-ventilated area. This curing process helps prevent rot during storage.
Store the dried tubers in a well-ventilated container, such as a cardboard box or crate, layered with a medium like peat moss, vermiculite, or wood shavings to maintain humidity and prevent contact between tubers. The storage area should remain cool, ideally between 40-50°F (4-10°C), and consistently dry, free from freezing temperatures or excessive moisture. Regular inspection throughout the winter ensures the tubers remain healthy and free from rot or shriveling.