Dahlia ‘Karma Irene’ is a favored choice among gardeners for its striking appearance and robust growth. This dahlia cultivar produces abundant, vibrant blooms throughout the growing season, making it a popular addition to various garden settings due to its consistent performance and visual charm.
Distinctive Features of Dahlia Karma Irene
‘Dahlia Karma Irene’ is known for its distinctive blooms, displaying a radiant blend of orange and red, often with a golden center. These fully double flowers measure 4 to 6 inches (10-15 cm) in diameter, showcasing a waterlily-like form with broad, somewhat sparse ray florets. The plant grows upright and vigorously, reaching 2 to 4 feet (60-120 cm) tall. It blooms prolifically, producing many flowers on strong stems from midsummer until the first frost.
Cultivation and Care
Planting
Plant ‘Dahlia Karma Irene’ tubers after the last spring frost, once soil temperatures are above 60°F (15°C). Choose a location with full sun for at least six hours daily; light afternoon shade can be beneficial in hotter climates. Dig a hole 4 to 6 inches (10-15 cm) deep and place the tuber horizontally with the growing eye facing upward. Space individual plants 18 to 24 inches (45-60 cm) apart, or 12-18 inches (30-45 cm) between plants and 2-3 feet between rows if planting in rows, to allow for proper air circulation and growth.
Soil Requirements
‘Dahlia Karma Irene’ thrives in well-draining soil rich in organic matter, with an ideal pH of 6.5 to 7.0 (neutral to mildly acidic). Amend the soil with 2 to 3 inches (5-10 cm) of compost or well-rotted manure before planting to improve structure and fertility. Avoid heavy clay or overly rich, organic-based soils, as they can lead to root rot.
Watering
Consistent moisture is important for ‘Dahlia Karma Irene’ throughout its growing season. Avoid overwatering, especially immediately after planting, as tubers can rot in wet or cold soil. Once green shoots emerge, regular and deep watering, one to three times per week, encourages strong root development. During hot or dry periods, daily watering may be needed to prevent the soil from drying out.
Fertilization
Dahlias are heavy feeders and benefit from a consistent fertilization schedule. At planting, incorporate a balanced fertilizer, such as a 16-16-16 formula, into the soil. Once plants reach 12 to 18 inches (30-45 cm) tall, switch to a low-nitrogen fertilizer, like a 5-10-10 ratio, to promote blooms over foliage. Fertilize every three to four weeks throughout the growing season for continuous blooming.
Staking and Support
Due to its height and abundant blooms, ‘Dahlia Karma Irene’ benefits from staking or other support systems. Place stakes next to tubers at planting time to easily tie stems as the plant grows, preventing breakage and keeping the plant upright. For multiple plants, methods like the “corral method” with T-posts and twine offer effective communal support.
Pinching and Deadheading
Pinching young dahlia plants encourages bushier growth and more blooms. When the plant reaches 10-12 inches (25-30 cm) tall with at least four sets of leaves, remove the central growing tip just above a leaf set. This redirects energy to produce multiple side shoots and more flowers. Deadheading, the removal of spent blooms, stimulates new flower buds, extending the blooming period until frost.
Winter Dormancy and Storage
In colder climates (USDA Hardiness Zones 3-7), ‘Dahlia Karma Irene’ tubers need to be lifted and stored indoors for winter. Begin this process after the first hard frost turns the foliage black, signaling dormancy. Cut stems back to a few inches above ground, then carefully dig up the tubers, avoiding damage.
Shake off excess soil. Some growers wash tubers to remove all soil, then allow them to dry thoroughly for several days in a cool, dark, well-ventilated area to cure. Once cured, store them in a cool, dark, frost-free location between 40-50°F (7-10°C).
Store in boxes or bins, layered with peat moss, vermiculite, or sand to maintain humidity and prevent drying. Periodically check stored tubers for rot or excessive drying, adjusting humidity as needed.
Using Dahlia Karma Irene
‘Dahlia Karma Irene’ is highly valued for its versatility, especially as a cut flower. Its strong, straight stems and vibrant, long-lasting blooms make it a favorite for floral arrangements. Harvest when the flower shows color and is about halfway open; these dahlias can last 7 to 12 days in a vase. Placing freshly cut stems in water with a post-harvest additive can enhance longevity.
In the garden, ‘Dahlia Karma Irene’ serves as a captivating focal point or a dynamic addition to sunny borders. Its upright habit and prolific flowering contribute significant visual interest, especially when planted in groups of three or more for a bolder display. Its moderate height also allows for inclusion in larger containers on patios or balconies.