Agapanthus 'Navy Blue'

Description and Characteristics

Agapanthus 'Navy Blue', also known as African Lily 'Navy Blue', is a striking herbaceous perennial prized for its deep, vivid blue flowers and long, elegant stems that provide vertical interest and a splash of bold colour from mid- to late summer. Each plant forms a dense clump of strap-like, glossy green foliage, from which emerge tall scapes topped with rounded clusters (umbels) of trumpet-shaped flowers.

Reaching up to 80–100 cm in height when in bloom and spreading 40–60 cm, ‘Navy Blue’ is a mid- to tall-sized agapanthus ideal for mixed borders, containers, and coastal gardens. Its intense blue hue makes it a garden standout, pairing beautifully with both warm and cool colour palettes. It is also a magnet for bees, butterflies, and other pollinators, making it a valuable addition to wildlife-friendly designs.

• Vivid navy-blue flowers in rounded clusters

• Graceful upright stems and lush green basal foliage

• Blooms from July to September

• Height: 80–100 cm; Spread: 40–60 cm

• Excellent in borders, containers, and cut flower arrangements

• Ideal for sunny, well-drained sites including coastal and drought-prone gardens

Growing Conditions and Maintenance

Agapanthus 'Navy Blue' is easy to grow and thrives with plenty of sun, moderate moisture, and good drainage. It is suitable for growing in both open ground and containers, and it appreciates crowding in pots to encourage flowering.

• Light Requirements:

  • Requires full sun (6+ hours daily) for optimal flowering

  • Will tolerate light partial shade, though flowering may be reduced

• Soil Preferences:

  • Prefers well-drained, fertile soil

  • Tolerates poor, sandy, or gritty soil once established

  • Avoid waterlogged or clay-heavy soil

• Watering Needs:

  • Water regularly during the growing season, especially in hot, dry periods

  • Allow soil to dry slightly between waterings

  • Once established, agapanthus is moderately drought-tolerant

• Feeding:

  • Feed in spring with a balanced fertiliser

  • Apply a high-potash fertiliser (like tomato feed) every 2–3 weeks from late spring to support flowering

  • Avoid overfeeding with nitrogen, which promotes foliage over flowers

• Deadheading and Pruning:

  • Remove spent flower heads to maintain appearance and encourage more blooms

  • Leave seed heads over winter for ornamental value or remove to conserve energy

  • In spring, remove any dead or damaged leaves

• Winter Care:

  • Hardy in Zones 7–10, but protect the crown with mulch in colder areas

  • In containers, move to a sheltered spot or unheated greenhouse over winter

  • In very cold areas, grow in pots and lift before frost

Design Use, Companion Plants, and Pollinator Benefits

‘Navy Blue’ is a standout in both formal and naturalistic garden designs. Its upright habit and rich flower colour lend themselves to repetition planting, contemporary schemes, or Mediterranean-style layouts.

• Design Uses:

  • Ideal for borders, large containers, coastal gardens, and urban spaces

  • Excellent as a focal plant or used in repeating groups

  • Suitable for low-maintenance, drought-tolerant, or pollinator gardens

• Companion Plants:

  • Pairs well with ornamental grasses, echinacea, salvia, gaura, coreopsis, and lavender

  • Complements silver-leaved or blue-toned plants like perovskia or artemisia

  • Strong contrast with warm tones like crocosmia or rudbeckia

• Pollinator Support:

  • Attracts bees, butterflies, and hoverflies

  • Excellent nectar plant during midsummer when many perennials wane

• Cut Flower Use:

  • Long-lasting in the vase (up to 10 days)

  • Harvest stems when most buds are just beginning to open

• Propagation and Division:

  • Can be divided every 4–5 years in spring or autumn to maintain vigour

  • Flowering may be reduced the season after division but will recover

• Pests and Diseases:

  • Generally pest- and disease-resistant

  • May be susceptible to snails, slugs, or crown rot if overwatered

We currently only deliver within the island of Ireland, other countries can be quoted for by contacting [email protected] or via telephone on 06964084
 

Standard Delivery is FREE on orders over €250*

All standard deliveries will be completed within 5-7 working days via Fastway Couriers, any delay to this delivery time, the customer will be notified by One of our staff.

The in-Store delivery charge will vary compared with online, in-store delivery charge is done on a case by case basis. 

* Only mainland Ireland addresses qualify for free delivery.
 

Live Plants Delivery

Our live plants are packed with care and diligence by our staff, our horticulturists review each plant before despatch to ensure quality is maintained.
Live Plant delivery charges are not calculated on weight but on the space required per package to ensure safe delivery, so delivery charges may vary as some plants require more space than others when packed.
All live plants are despatched within 3-5 working days where possible, our couriers aim to deliver within 48 hours of despatch from our Garden Centre to allow the plant to arrive in healthy condition.
 

Click & Collect

Can’t wait for delivery? Why not try our FREE Click & Collect service? Simply make your purchase online and collect it from our store located in Croagh Co. Limerick. Our staff will contact you by phone when your order is ready for collection (Please allow 24 hours minimum). When collecting your item, call the store on 069-64084. We will then load into your car as required. This service is available in-store 9am – 6pm Monday – Saturday (No collections on Sundays)

Click here for more information about our shipping conditions.

You can pay your online order either by credit card or via Paypal.
If you have any further questions about the online order payment please contact us via ­069 640 84 or mail.