Allium atropurpureum

Overview & Features

• Allium atropurpureum is a striking ornamental onion producing dense, dome-shaped clusters of deep burgundy to purple star-shaped flowers.

• Flowers appear in late spring to early summer, adding rich colour and strong contrast to borders.

• Typically reaches 70–90 cm in height, making it ideal for the middle or back of borders.

• Features narrow, strap-like foliage that dies back as flowers emerge.

• Attractive to bees and other pollinators.

• Excellent for cut flower arrangements and can also be dried.

• Adds architectural structure and bold vertical interest.

• Suitable for naturalistic planting schemes and mixed perennial borders.

This variety is valued for its intense colour and elegant, slightly flattened flower heads.

Planting & Positioning

• Plant bulbs in autumn for flowering the following late spring or early summer.

• Choose a position in full sun for the best flowering performance.

• Prefers well-drained soil and does not tolerate waterlogged conditions.

• In heavy clay soils, improve drainage by incorporating grit before planting.

• Plant bulbs approximately 10–15 cm deep, around three times their own depth.

• Space bulbs about 15 cm apart to allow room for growth.

• Position bulbs with the pointed end facing upwards.

• Ideal for borders, gravel gardens, raised beds, and container displays.

Allium atropurpureum performs best in open, sunny areas with good air circulation.

Watering, Feeding & Flowering

• Water after planting to help settle the soil.

• During spring growth, keep soil moderately moist but never waterlogged.

• Once established, plants are relatively drought tolerant.

• Avoid excessive watering during winter dormancy.

• Feed in early spring with a balanced, slow-release fertiliser to support strong stem and flower development.

• Avoid high-nitrogen fertilisers that may encourage foliage at the expense of blooms.

• Flowering typically occurs in late spring to early summer.

• Allow foliage to die back naturally after flowering to replenish the bulb for the following year.

Proper feeding and good drainage help ensure reliable repeat flowering.

Pruning, Maintenance & General Care

• Deadhead spent flower heads if you prefer a tidy appearance.

• Alternatively, leave seed heads in place for added architectural interest.

• Remove yellowing foliage only once it has fully withered.

• Divide congested clumps in autumn if flowering becomes reduced.

• Generally pest and disease resistant when grown in well-drained soil.

• Apply a light mulch in autumn in colder regions, ensuring bulbs remain dry.

• Suitable for naturalising in sunny borders or meadow-style planting schemes.

With full sun and excellent drainage, Allium atropurpureum will deliver dramatic late-spring colour and elegant structure year after year.

• Size
  3L

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.