Dahlias are popular garden plants, known for their vibrant colors. The ‘Creve Coeur’ dahlia is a striking choice, adding a dramatic focal point to landscapes. Its impressive blooms significantly enhance garden aesthetics.
Unique Features of Creve Coeur Dahlia
The ‘Creve Coeur’ dahlia features large, semi-cactus dinnerplate blooms, 10 to 12 inches (25 cm) in diameter. Elegantly twisted petals create a dynamic, sculptural appearance. Its deep, smoky, velvety red color makes a bold statement. This variety grows 4 to 5 feet (120-150 cm) tall, with long, sturdy stems supporting its large flowers.
Planting and Cultivation
Careful site selection and soil preparation are key for successful cultivation. Dahlias thrive in full sun, needing at least 6 to 8 hours of direct sunlight daily. Soil should be rich, well-draining, and amended with organic matter like aged manure or compost. An ideal soil pH ranges from slightly acidic to neutral, between 6.0 and 7.5. Loosen the soil to at least 12 inches deep for tuber expansion.
Watering is specific, especially after planting. Do not water tubers immediately after planting unless soil is exceptionally dry; excess moisture causes rot. Once shoots emerge, water deeply and consistently (3-4 times per week), ensuring water penetrates 8 to 10 inches deep. Increase watering during hot periods, but avoid overwatering to prevent root rot.
Regular fertilization promotes optimal growth and abundant blooms. Use a low-nitrogen fertilizer, higher in phosphorus and potassium. Suitable NPK ratios include 5-10-10 or 10-20-20. Apply fertilizer approximately 30 days after planting, then every 3 to 4 weeks throughout the growing season. Incorporating processed cow or steer manure prior to planting also enriches the soil.
‘Creve Coeur’ dahlias require staking to prevent stems from breaking due to large blooms or windy conditions. Place 6-foot hardwood stakes or bamboo poles about 3 inches from the center stem, driven at least 12 inches deep. Tie the plant to the stake every 12 inches as it grows for continuous support.
Ongoing Care and Winter Preparation
Deadheading and pruning promote continuous blooming and plant health. Removing spent blooms encourages more flowers instead of seed production. Pruning also improves plant shape and increases airflow, deterring diseases.
Dahlias are susceptible to pests and diseases. Pests include aphids, spider mites, slugs, and earwigs. Powdery mildew is a frequent fungal disease, appearing as a white coating on leaves in warm, humid conditions. Other issues include botrytis blight and mosaic viruses. Preventative measures include good air circulation and consistent moisture to reduce plant stress, and physical removal of pests or affected plant parts.
In cold regions, ‘Creve Coeur’ dahlia tubers must be lifted and stored. After the first frost kills foliage, cut stems back to a few inches. Carefully dig up tubers, remove excess soil, and dry for several days to cure. Store tubers in a cool, dark, dry location (40-45°F / 4-7°C, 80-90% humidity). Use materials like vermiculite, peat moss, or sawdust in crates or bins to prevent contact between tubers and reduce rot.