The ‘Okapis Sunset’ dahlia offers a stunning display of warm hues, making it a desirable garden addition. Its vibrant coloration and unique bloom structure provide continuous color from midsummer through fall, captivating gardeners with its consistent and eye-catching blooms.
Unique Characteristics of Okapis Sunset Dahlia
The ‘Okapis Sunset’ dahlia is distinguished by its captivating color palette, blending orange, yellow, and white tones. These sunset shades flare across the petals. This dahlia typically features a “Cactus-form” or “semi-cactus” flower, characterized by tubular or spiky petals that curl elegantly.
Blooms are medium to large-sized, ranging from 5 to 10 inches across. The plant generally reaches 3 to 4 feet (36-40 inches or up to one meter), suitable for mid to back-of-border plantings. Its robust growth makes it a popular choice for cut flower arrangements.
Cultivating Okapis Sunset Dahlia
Site Selection and Soil Preparation
‘Okapis Sunset’ dahlias thrive in full sun, requiring at least six to eight hours of direct sunlight daily for optimal bloom production. They can tolerate some partial shade, especially in hotter climates where afternoon shade can be beneficial.
Dahlias perform best in well-drained soil rich in organic matter. A slightly acidic to neutral soil pH, between 6.5 and 7.0, is suitable. Amend heavy clay soils with compost or well-rotted manure to improve drainage and fertility, preventing tuber rot.
Planting Tubers
Plant ‘Okapis Sunset’ dahlia tubers in spring, after the last frost and when soil temperature reaches approximately 60°F (15°C). Plant tubers 4-6 inches deep, with the “eye” or sprout facing upwards. Space individual tubers 12-30 inches apart for adequate air circulation.
Light Requirements
Ample sunlight is essential for prolific blooming. Consistent full sun directly influences the number and size of flowers. Insufficient light results in fewer blooms and weaker plant growth.
Watering
Initial watering after planting should be minimal to prevent tuber rot, unless the soil is exceptionally dry. Once green shoots emerge, consistent moisture is important. Deep watering two to three times a week is generally sufficient, especially during dry periods. Adjust frequency based on climate and soil type; daily watering may be needed during peak summer heat.
Fertilizing
Dahlias are heavy feeders. They benefit from a fertilizer low in nitrogen and higher in phosphorus and potassium, such as a 5-10-10 NPK ratio. Apply fertilizer approximately 30 days after planting, then monthly throughout the growing season. Over-fertilizing with high-nitrogen products can lead to lush foliage at the expense of flowers.
Ongoing Maintenance and Bloom Production
Staking and Support
Due to their height and large blooms, ‘Okapis Sunset’ dahlias often require staking to prevent stems from breaking, especially in windy conditions or when laden with flowers. Insert a sturdy stake at planting time. As the plant grows, tie stems loosely to the support.
Deadheading for Continuous Blooms
Deadheading, the removal of spent flowers, encourages continuous blooming and maintains plant vigor. Removing faded blooms redirects energy from seed production toward new flowers. Deadhead regularly by cutting the spent flower stem back to the first set of healthy leaves or a developing bud. This practice also improves the plant’s appearance.
Pest and Disease Management
‘Okapis Sunset’ dahlias can encounter common garden pests and diseases. Slugs and aphids are frequent visitors; organic controls like Sluggo® Plus for slugs are effective. Monitor plants regularly for early detection. Good air circulation through proper spacing and pruning helps prevent fungal diseases like powdery mildew. Promptly remove any affected plant parts.
Winter Care and Storage
In colder climates (USDA Zones 3-7), ‘Okapis Sunset’ dahlia tubers are not winter-hardy and must be lifted before the first hard frost. Dig them a couple of weeks after the first hard frost causes foliage to brown, allowing the plant to store energy. Carefully dig up the tuber clump, avoiding damage to the delicate “necks.”
After lifting, gently shake off excess soil and air dry tubers under cover for 24 hours to several days. Once dry, brush off remaining dirt. Store tubers in a cool, dark, and dry location, ideally between 40-50°F (4-10°C), such as an unheated basement.
Pack them in newspaper-lined boxes, surrounded by lightly moistened sand, peat moss, or vermiculite to prevent shriveling and rot. Check regularly for signs of rot or shriveling. In warmer climates (Zones 8-10), tubers can remain in the ground with heavy mulching.
Common Challenges and Solutions
A common issue when growing ‘Okapis Sunset’ dahlias is a lack of blooms, often due to insufficient sunlight or excessive nitrogen fertilization. Ensure plants receive full sun and use a low-nitrogen, high-phosphorus fertilizer.
Leggy growth, characterized by tall, spindly stems with sparse foliage, results from too much nitrogen or inadequate light. Provide more direct sunlight and adjust fertilizer ratios for bushier growth. Yellow or brown leaves often indicate watering issues; yellowing suggests overwatering and root rot, while browning tips point to under-watering or nutrient deficiencies. Consistent, deep watering without waterlogging the soil is important for healthy foliage.