Nigrum Allium (Allium hollandicum Nigrum) Hero ImgNigrum Allium (Allium hollandicum Nigrum) Hero ImgNigrum Allium (Allium hollandicum Nigrum) Img 2

Ornamental Black Garlic Bulbs

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  • Colour: White
  • Height: 70-80 cms
  • Scent: Faint
  • Flowering:June
  • Bulb Size: 10/12 cms
  • Planting Depth: 4 times the height of the bulb
  • Planting Months: September - December
Choose a size
Pack of 25
Bulbs
£9.95each
Qty
1-3
4 +
£
£ 9.95
£ 8.95

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Description

Allium hollandicum 'Nigrum' AKA Black Garlic

Allium nigrum bulbs, despite the common name Black Garlic, is a white allium bulb. It produces tall stemmed, creamy white globular flowers in late spring or early summer depending on weather and location.

Allium nigrum is a favourite in our range of flowering alliums with delicate star-shaped flowers in pom-pom clusters that form most a nearly complete sphere; think of a tennis ball with a bit cut off !).

The blooms are made up of creamy-white to light-purple petals surrounding a green pearl-like centre; a jewel of the garden. Presented on tall stems growing up to 90cm in height, allium nigrum creates what the Royal Horticultural Society (RHS) calls 'a striking silhouette.'

This is one of the larger and more versatile of the flowering allium family. It's a robust, very hardy, clump forming perennial and is ideal for a sunny herbaceous border. Plant in groups for the greatest impact.

Why we like it

  • It's versatile; creating a dramatic contemporary statement, or equally at home in a traditional cottage garden
  • Easy to care for and very hardy

Planting Allium Nigrum know-how

  • Plant in autumn in a sunny or shady spot
  • Plant bulbs 15cm deep and 10-15cm apart
  • A total spread averaging 30cm
  • Likes fertile well drained soil
  • Its grey-green leaves start to die back after blooming in early summer, so disguise amongst floor-covering flowers and shrubs

Top tip

Avoid over watering in late summer once they become dormant, says the RHS.

White alliums have grown in popularity after their appearance in Cleve West's winning Best in Show Garden at the Chelsea Flower Show 2012.
Confusingly, pioneering botanist Linnaeus named the predominantly white flowered Allium nigrum - meaning black - after its dark-green-black centre.

Please note that this bulb is not edible and has nothing to do with the Asian delicacy black garlic, which is prepared by slow cooking normal edible garlic, Allium sativum, in a moist environment over a few weeks.

What to expect

It's Spring Planting Season 2025

Pot grown plants on the nursery

Pot Grown & Plug Plants Delivered

From seedlings in jumbo plugs; Dahlia tubers; small P9 & 1 Litre plants; up to trees in big 15L pots
Expertly packed plants ready for delivery

Direct from the Nursery Value

We work with large batches of orders to save you money. Lead times for plants in stock are around 2 weeks
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No more broken plants in the post!

When your order is ready, it's expertly packed by Rodney and delivered by next day courier; if anything goes wrong, call Dan on 01963 359 444
Planting out potted plants in Spring

Spring is perfect planting time

Roots love the warm soil; the plant has time to settle in before mid-Summer heat
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In your garden

Clematis covering walk-through trellis in Fionas quaint garden
Clematis covering walk-through trellis in Fionas quaint garden
Spring Cherry Blossom Trees and Hedging
Spring Cherry Blossom Trees and Hedging
Allium Flowers in Somerset Spring Garden
Allium Flowers in Somerset Spring Garden
Beautiful Spring Bulbs
Beautiful Spring Bulbs