Description
Agapanthus Cobalt Blue – Deciduous African Lily
Agapanthus Cobalt Blue is a striking deciduous African Lily renowned for its large globular flower heads packed with rich violet-blue blooms. Each flower head measures approximately 11–13cm across and can contain up to 40 individual florets, creating a spectacular display of colour throughout the summer months. The vibrant flowers are held on strong upright stems above attractive green strap-like foliage, providing outstanding architectural interest in borders, containers and mixed perennial plantings.
Growing to approximately 80–120cm in height, Agapanthus Cobalt Blue is a superb garden performer with excellent presence and long-lasting floral impact. The deep violet-blue flowers stand proudly above the foliage and attract bees and other pollinating insects, making this variety a valuable addition to wildlife-friendly gardens. Its impressive flower heads also make excellent cut flowers, bringing vibrant colour and elegance indoors.
Key Features of Agapanthus Cobalt Blue
- Deciduous Agapanthus variety
- Rich violet-blue flower heads
- Flower heads 11–13cm across
- Up to 40 florets per flower head
- Flowers from July to September
- Excellent for borders and containers
- Attractive to bees and pollinators
- Excellent cut flower variety
Growing Agapanthus Cobalt Blue
Agapanthus Cobalt Blue thrives in a sunny position with fertile, well-drained soil. Full sun encourages abundant flowering and helps produce strong stems capable of supporting the large flower heads. Once established, plants are relatively drought tolerant, although regular watering during prolonged dry periods will encourage the best floral display. Well-drained soil is particularly important during winter months.
As a deciduous variety, the foliage naturally dies back in autumn before fresh growth emerges in spring. Container-grown plants perform exceptionally well and are ideal for patios and terraces where the dramatic flowers can be appreciated at close range. Remove spent flower stems after flowering and apply a winter mulch in colder regions to help protect the crown and encourage vigorous regrowth the following season.
- Position: Full sun
- Soil: Fertile, well-drained soil
- Height: 80–120cm
- Spread: 50–60cm
- Flowering Period: July to September
- Foliage: Deciduous
- Hardiness: Hardy in most UK gardens
Related Plants and Further Information
Browse our full range of Agapanthus plants to discover more varieties suitable for borders, containers and patio displays.
For additional cultivation advice, planting tips and ongoing care information, visit the Royal Horticultural Society Agapanthus Growing Guide.
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