Allium Bulbs

Creating the most magnificent display, Alliums come in all sorts of shapes and sizes. Although a firm favourite with avid gardeners, these are most popular with bees, butterflies and insects who can not resist those nectar-rich flowers. Gigantic alliums such as Giganteum will create drama planted in borders, whilst Wild Garlic will fill the air with its scent after those early spring showers.

 

Like everything we supply here at Boston Seeds, we pride ourselves on supplying professional quality - and for flower bulbs, that means BIG! Our bigger bulbs produce bigger, better and bolder flowers. Choose from our exciting range of varieties - allium surprise bulb collection, old favourites, garden classics as well as striking new lines for 2022.

Allium bulbs will be available to order from June 2022 for autumn planting. For spring planting, view our wildflower bulbs in the green.

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Delivery from September
Pollinator

BS Wild Garlic Bulbs (Allium ursinum)

A wild relative of chives, Wild Garlic (or Ramsons) grows from a small bulb and often spreads to form large clumps. It can be found in damp woods, scrub, hedges and on shady banks, where its garlicky aroma will fill the air. The leaves are edible but have a surprisingly mild flavour.

  • This is an excellent plant for ground cover in a wet corner of the garden. 
  • These wild garlic bulbs are UK native
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Aflatunense Allium Bulbs
Delivery from September

Aflatunense Allium Bulbs

Producing large spherical flower heads, that are a fantastic lilac purple. These are a must to attract bees and other pollinators into your garden.

  • Height (cm): 70cm
  • Bulb Size (cm): 10 / 12cm
  • Blooms: May/June
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Ambassador Allium Bulbs
Delivery from September

Ambassador Allium Bulbs

A structural masterpiece! This stunning giant allium will add height to your borders as well as attracting an array of bees, butterflies and other pollinators to fill your garden with early summer flurry. Ideal for use as dried cut flowers in your home once they have finished flowering.

  • Height (cm): 130cm
  • Bulb Size (cm): 20+ cm
  • Blooms: June/ July
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Delivery from September

Atropurpureum Allium Bulbs

Looking stunning when planted in a border amongst contrasting ornamental grasses and other foliage, these giant deep purple spherical flowers appear on a tall upright stem. 

  • Height (cm): 75cm
  • Bulb Size (cm): 7 / 8cm
  • Blooms: May/June
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Delivery from September

Caeruleum Allium Bulbs

Easy to grow, these deep aqua blue blooms will appear mid-May adding a boost of colour into your beds' borders or pots. they can be in partial shade or full sun and prefer well-drained soils.

  • Height (cm): 60cm
  • Bulb Size (cm): 4 / 5cm
  • Blooms: May/June
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Delivery from September

Christophii Allium Bulbs

A more unusual Allium, the Christophii form the classic globe flower head but produce multiple starburst flowers per stem. Those early summer dews bring these blooms alive with a shimmer of silver, these lilac flowers come into their own.

  • Height (cm): 40cm
  • Bulb Size (cm): 10 / 12cm
  • Blooms: June
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Cowanii Allium Bulbs
Delivery from September

Cowanii Allium Bulbs

These small dainty pure white blooms have multiple flowers per stem. These are a smaller allium and ideal for adding extra colour into your borders yet also good for pots and cut flowers.

  • Height (cm): 40cm
  • Bulb Size (cm): 5+ cm
  • Blooms: June
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Giant Allium Bulb Collection
Delivery from September

Giant Allium Bulb Collection

Our best value selection for adding the beautiful giant alliums into your garden displays. These structural impressive flowers will add height and interest to borders and landscaped areas whilst also drawing in a flurry of bees, butterflies and other pollinating insects. This mixture will contain equal quantities of the following:

  • Globemaster
  • Mount Everest
  • Giganteum
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Delivery from September

Giganteum Allium Bulbs

Large violet-purple globes, that open up to 6 inches across, these giant alliums add structure and focus to borders and beds along with a great talking point for garden parties.

  • Height (cm): 150cm
  • Bulb Size (cm): 20cm+
  • Blooms: June/July
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Delivery from September

Gladiator Allium Bulbs

Standing over a meter high these enormous lilac/ purple globe heads can be up to 15cm across. These make great cut flowers and will also spread over time to create a dense display of tall blooms.

  • Height (cm): 120cm
  • Bulb Size (cm): 20cm+
  • Blooms: June
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Graceful Beauty Allium Bulbs
Delivery from September

Graceful Beauty Allium Bulbs

Producing several small star-like flowers on each stem, the flower heads open to reveal beautiful crisp white flowers with purple centres. Suitable for borders, these also look stunning as part of a bulb lasagne in pots.

  • Height (cm): 40cm
  • Bulb Size (cm): 6+ cm
  • Blooms: June/ July
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Moly Allium Bulbs
Delivery from September

Moly Allium Bulbs

A firm favourite with the bees, these golden yellow blooms appear with multiple flowers on each stem. Excelling in woodland areas they are a fast-growing hardy allium.

  • Height (cm): 25cm
  • Bulb Size (cm): 5+ cm
  • Blooms: June/ July
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Delivery from September

Mount Everest Allium Bulbs

Exuberant pure snowy white gigantic blooms, the Mount Everest Alliums are a real showpiece and head-turner. Suitable for adding height and structure into borders and beds.

  • Height (cm): 120cm
  • Bulb Size (cm): 20+cm
  • Blooms: June
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Delivery from September

Neapolitanum Allium Bulbs

Planted in mass, these dainty little alliums have delicate clusters of pure white flowers appearing on one stem. They will appear in late spring and create swathes of white blooms that can also be used for cut flowers.

  • Height (cm): 40cm
  • Bulb Size (cm): 4+ cm
  • Blooms: April/ May
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Delivery from September

Nectaroscordum Allium Bulbs

Also known as Honey Lily or Siculum, this unusual flower has long hanging bell-shaped flowers, that is a creamy green with tinges of pink on the petals. The decorative seed heads will appear in late summer.

  • Height (cm): 60cm
  • Bulb Size (cm): 8 / 10cm
  • Blooms: May/June
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Delivery from September

Purple Sensation Allium Bulbs

A firm gardeners favourite, these bulbs will produce a vivid purple flower head that is spherical in shape. Attracting pollinators, will not only give interest and height to planted borders but also a great source of food.

  • Height (cm): 90cm
  • Bulb Size (cm): 12/14cm
  • Blooms: May/June
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Delivery from September

Red Mohican Allium Bulbs

These burgundy red flowers appear towards the end of spring/ early summer and have distinctive tufts form white florets that will fade with age. An unusual variety that is perfect for use as cut flowers.

  • Height (cm): 100cm
  • Bulb Size (cm): 10+ cm
  • Blooms: May/June
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Roseum Allium Bulbs
Delivery from September

Roseum Allium Bulbs

Appearing in early May these dainty delicate blooms are a delight in any garden. Perfect to add in amongst your borders or in pots, they appear with light pink flowers based on a single stem.

  • Height (cm): 35cm
  • Bulb Size (cm): 4 / 5cm
  • Blooms: May
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Delivery from September

Sphaerocephalon Allium Bulbs

Planted in groups, this allium produces distinctive egg-shaped flowers that bloom into a crisp purple. Once finished the flower heads can be dried and sprayed and create decorative displays in your home.

  • Height (cm): 60cm
  • Bulb Size (cm): 6+cm
  • Blooms: June
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Next Day Delivery

Bulb Planter

Making bulb planting easier, quicker and cleaner, our bulb planter is the ideal tool for helping you plant your spring-flowering bulbs.

  • Made of high quality steel
  • Automatic release on handle
  • Duroplast coating - impact, elastic, abrasion, and corrosion - resistant
  • Depth Scale
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Delivery from September

Bulb Fibre

Specifically designed to help bulbs establish in pots, without the risk of the bulbs rotting, providing an open and free draining soil structure.

  • Ideal for planting with Narcissi, Crocus, Hyacinths and other spring-flowering bulbs
  • Universal bulb potting fibre
  • 500gm bag - This pack is sufficient for 3 x 1-litre pots
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Delivery from September

Bulb Planting Essentials Pack

Our bulb planting essentials pack has been put together for the ease of ensuring quick planting and a great display. The bulb planter will help you plant the bulbs with ease whilst the fibre will ensure the bulbs do not rot when planted into pots or containers. Using the bulb fertiliser will ensure your bulbs have all the nutrients they need whilst establishing.

  • 1 x Bulb Fibre
  • 1 x Bulb Planter
  • 1 x Bulb Fertiliser
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Bulb Fertiliser
Delivery from September

Bulb Fertiliser

Our flowering bulb fertiliser has been specifically designed to help your spring-flowering bulbs flower to their full potential. Whether you are establishing in pots or containers, sprinkle a small amount into each hole prior to planting your bulbs. Also suitable for use in early spring to encourage your bulbs to flower well in the following season.

  • Tailored to give your bulbs all the nutrients they need
  • Can be mixed with compost or Bulb Fibre
  • NPK - 12.11.18 + MgO
  • Recommended coverage: 5kg per 200sqm. Apply at 25g/sqm
  • Not suitable for use with Wildflower Bulbs
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Daffodil Bulb Fertiliser
Delivery from September

Daffodil Bulb Fertiliser

Whether you are establishing in pots, hedgerows or large landscaped areas sprinkle a small amount into each hole or mix in with the soil/ compost prior to planting your bulbs. Specifically formulated to encourage your daffodil bulbs to flower well into the following season, this blend is also suitable for use in early spring. Avoid using a high nitrogen fertiliser as this can cause daffodil blindness.

  • Tailored to give your bulbs all the nutrients they need
  • Encouraging a longer and consistent flowering period
  • Can be mixed with compost or Bulb Fibre
  • NPK - 5.10.20 + 2% MgO + trace element
  • Recommended coverage: 5kg per 200sqm. Apply at 25g/sqm
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Alliums: Advice On How To Grow Them (And Why!)

 

If you’ll pardon the pun, this bulb flower has a real way of growing on you: it produces medium-to-tall upright stalks, ending in a bold globe of fluffy-looking florets in a rich violet colour (though several species have lighter lilac petals). These punchy, purple pom-poms have a real way of drawing the eye: as such, you’re best scattering them evenly throughout a sunny border or a tall, grassy meadow. They’re also excellent cut flowers!

 

Fun Facts

The ornamental allium symbolises unity and patience. Fitting, as it grows dozens of florets in one bulb. In fact, the word “onion” is derived from the latin word unio, as in union!

There aren’t many myths surrounding onions, as you may expect from a plant most commonly seen in the kitchen; however, there are some myths linking them to the magic of tears and the importance of emotional release.

 

How to grow

Alliums are best planted early-to-mid autumn, and typically flower in May to June. They need well-drained soil and plenty of sunlight - be wary of cold or wet conditions where the bulbs may rot. Their tall, upright stems also require protection from the wind.

 

Smaller species of allium should be planted roughly 10cm apart; taller species require 20cm between each bulb. Alternatively, they can be planted in containers.

 

Alliums are tolerant to drought and dislike being watered in the summer. Alliums grown in containers will need regular watering, but take care that they don’t get too damp.

 

Alliums have sparse foliage at the base that will begin to die at flowering time. You can cover these up with lower-growing flowers, or remove them to no ill effect.

 

Species & Styles

Popular allium species include Gladiator and Globemaster: these are formidable flowers in terms of size alone, with their flower heads growing 10-25cm across! Similarly, the well-named Mount Everest is one of the taller allium species at an average of 90cm tall.

 

Thinking about mixing and contrasting colours? The more popular varieties are iris purple, but there are plenty of others: the aforementioned ‘Mount Everest’ breed, as well as the smaller Graceful’ Beauty breed, both have a pale silver-lilac colouration. Meanwhile, the later-blooming Allium atropurpureum and Allium sphaerocephalon have smaller, denser flower heads that bloom in a richer magenta (and the latter is accented with green).

Bright orange and yellow plants lend themselves to an eye-catching, summery effect. For a softer look, try a pale white or pink plant, or a plant with silver foliage.