Cosmos – Double Dutch White

Description

Cosmos – Double Dutch White

A stunning pure ice white variety producing multi-petalled flowers with a slight frill  on 1.0 m – 1.4 m  plants.  The delicate foliage and crystal white flowers make an outstanding background planting that blooms all summer long. Cosmos are easy to grow and literally thrive on neglect. Half-hardy annual, 4-5′ tall.

Cultivation advice for Cosmos – Double Dutch White

• Plant in well-draining soil with moderate fertility. Cosmos prefer full sun but can tolerate partial shade.
• Aim for a neutral to slightly acidic soil pH, around 6.0 to 7.0.
• Sow seeds directly into the garden after the last frost date. Ensure the soil is warm enough for germination.
• Scatter seeds lightly over prepared soil and cover them with a thin layer, about 1/4 inch deep.
• Keep the soil consistently moist but not waterlogged, especially during germination. Once established, they are somewhat drought-tolerant but benefit from regular watering during dry spells.
• Apply a balanced, all-purpose fertilizer at planting time to support initial growth. Avoid excessive nitrogen that might encourage foliage growth over flowers.
• Mulch around the plants to retain moisture and control weed growth. Maintain a weed-free area around Cosmos to reduce competition for nutrients.
• Regularly remove spent flowers to encourage continuous blooming. Deadheading also prevents seed formation, prompting the plant to produce more flowers.
• While ‘Double Dutch White’ Cosmos are generally sturdy, taller varieties may benefit from staking or support to prevent bending or breaking in windy conditions.
• Cosmos are generally resistant to pests and diseases. However, monitor for aphids or spider mites. Treat any issues promptly with organic remedies if necessary.
• If you wish to collect seeds, allow some flowers to mature and dry on the plant. Harvest seeds when the flower heads turn brown and store them in a dry place.
• Cosmos ‘Double Dutch White’ are annuals. In colder climates, collect seeds for the following year or replant new seeds after the last frost.
• If the seedlings appear crowded, thin them to provide adequate space for healthy growth, better airflow, and to reduce competition for nutrients.
• Prior to planting, amend the soil with organic matter like compost to enhance fertility, improve soil structure, and aid in moisture retention.
• Pair ‘Double Dutch White’ Cosmos with other pollinator-attracting plants like lavender, salvia, or coneflowers to create a vibrant, pollinator-friendly garden.
• Water at the base of the plants in the morning to allow the foliage to dry during the day, reducing the risk of fungal diseases. Avoid overhead watering.
• To encourage a bushier growth habit and more flower production, pinch the tips of young Cosmos plants when they are about 12 inches tall.
• Routinely inspect plants for signs of stress, pests, or diseases. Early detection enables timely intervention and minimizes potential damage.
• Cosmos generally thrive without heavy feeding. Avoid excessive fertilization as it might result in lush foliage at the expense of flowers.
• Extend the blooming period by sowing new seeds every few weeks. This ensures a continual display of flowers throughout the growing season.
• Observe how ‘Double Dutch White’ Cosmos responds to changes in sunlight, temperature, and watering. Adjust care practices based on their specific needs for optimal growth.
• Lastly, take pleasure in the elegance of these pure white flowers. ‘Double Dutch White’ Cosmos can be a stunning addition to any garden, providing a serene and charming display.