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Just when you think the allium season is over, Allium ‘Millenium’ steps in to steal the show! This late-flowering perennial brings a fresh burst of colour to the garden right when other alliums have faded, producing vibrant rosy-pink pom-pom blooms from mid to late summer.

Unlike traditional alliums, ‘Millenium’ is a true perennial, forming neat, compact clumps of glossy green foliage topped with tidy, rounded flower heads. One of its standout features is that it blooms while still in full leaf, creating a lush, well-rounded look that's perfect for borders, containers, and wildlife-friendly planting schemes.

Extremely hardy, low-maintenance, and reliably perennial, Allium ‘Millenium’ returns year after year with minimal fuss. Over time, it forms larger clumps, creating an increasingly impressive display that bees, butterflies, and other pollinators absolutely adore.

Whether planted in masses for a dramatic swathe of colour or tucked into mixed beds for added texture and height, ‘Millenium’ adds beauty and biodiversity to any garden.

How to plant Alliums

Plant Alliums in the Autumn for Spring flowering.
Choose a location to plant your Allium Bulbs, they like to be in full sunlight and well-drained soil.

Planting Alliums in the Garden

Once you have found the perfect spot in your garden to grow your Alliums, you need to dig holes in the flower bed that are three times the diameter of the bulb. For example, if the bulb is 5cm (2") in size then it needs to be planted 15cm (6") deep.
Plant the bulbs about 20-30cm (8-12") apart. For impact, plant in groups.
Alliums work well in rockeries and crowded gardens as they don't take up much space.
Add horticultural grit to heavy soil to improve water drainage.
The Allium bulbs need to be planted pointy end up.
Water the bulb well once in situ.
To help the soil drain well it is also beneficial to spread mulch, wood chips and organic matter over the entire planting area.
Alliums will flower around May/June.
Cut the Alliums back at the end of their blooming season. They will then continue to grow in your garden year on year with very little maintenance.

Planting Alliums in Pots

Plant Alliums the same depth for pots as in the garden. Plant three times the diameter of the bulb. For example, if the bulb is 5cm (2") in size then it needs to be planted 15cm (6") deep.
For a garden with limited space, you may want to produce a fuller pot display of spring flowers by layering your bulbs like a lasagne. Simply plant your bulbs deeper to start with, with the largest or latest flowering bulbs further down, moving to the smallest and earliest flowering in the top layer. The shoots from the lower bulbs will find their way around the other bulbs. If you are planting the Alliums first, allow 10cm (4") of soil underneath the bulbs.
Use a good-quality, multipurpose compost.
Add horticultural grit to heavy soil to improve water drainage.
The Allium bulbs need to be planted pointy end up.
Water the bulb well once in situ.
To help the soil drain well it is also beneficial to spread mulch, wood chips and organic matter over the entire planting area.
Alliums will flower around May/June.
Cut the Alliums back at the end of their blooming season. They will then continue to grow in your garden year on year with very little maintenance.

Description

Whether planted in masses for a dramatic swathe of colour or tucked into mixed beds for added texture and height, ‘Millenium’ adds beauty and biodiversity to any garden.

Additional Information

For more information on planting and growing Alliums.

Delivery / Returns

Delivery and P&P

This item is dispatched all year around.
All orders should be dispatched within 3-5 working days.
Postage cost to the UK (excluding N.Ireland) is £5.50.
Orders over £50 qualify for FREE delivery.
Unfortunately, we are not currently delivering to the EU. See Delivery page.
When your order is due for dispatch, you will receive a tracking email from us to track your parcel.
Your parcel will be sent on a 24-48 hour tracked service with DPD.

Returns and Refunds

You have the right to cancel your order at any time before it is dispatched.
All returns must be returned at your cost within 7 days of receipt.
Payment for the returned goods will be refunded within 7 days of the goods being received by us, less the postage charges.

Planting & Growing Instructions

How to plant Alliums

Plant Alliums in the Autumn for Spring flowering.
Choose a location to plant your Allium Bulbs, they like to be in full sunlight and well-drained soil.

Planting Alliums in the Garden

Once you have found the perfect spot in your garden to grow your Alliums, you need to dig holes in the flower bed that are three times the diameter of the bulb. For example, if the bulb is 5cm (2") in size then it needs to be planted 15cm (6") deep.
Plant the bulbs about 20-30cm (8-12") apart. For impact, plant in groups.
Alliums work well in rockeries and crowded gardens as they don't take up much space.
Add horticultural grit to heavy soil to improve water drainage.
The Allium bulbs need to be planted pointy end up.
Water the bulb well once in situ.
To help the soil drain well it is also beneficial to spread mulch, wood chips and organic matter over the entire planting area.
Alliums will flower around May/June.
Cut the Alliums back at the end of their blooming season. They will then continue to grow in your garden year on year with very little maintenance.

Planting Alliums in Pots

Plant Alliums the same depth for pots as in the garden. Plant three times the diameter of the bulb. For example, if the bulb is 5cm (2") in size then it needs to be planted 15cm (6") deep.
For a garden with limited space, you may want to produce a fuller pot display of spring flowers by layering your bulbs like a lasagne. Simply plant your bulbs deeper to start with, with the largest or latest flowering bulbs further down, moving to the smallest and earliest flowering in the top layer. The shoots from the lower bulbs will find their way around the other bulbs. If you are planting the Alliums first, allow 10cm (4") of soil underneath the bulbs.
Use a good-quality, multipurpose compost.
Add horticultural grit to heavy soil to improve water drainage.
The Allium bulbs need to be planted pointy end up.
Water the bulb well once in situ.
To help the soil drain well it is also beneficial to spread mulch, wood chips and organic matter over the entire planting area.
Alliums will flower around May/June.
Cut the Alliums back at the end of their blooming season. They will then continue to grow in your garden year on year with very little maintenance.

Care Instructions

How to care for Alliums

Add a potash feed to enhance growth and strengthen the bulbs for flowering year after year.
Allow flower to die back and remove any dead foliage in early Summer.
Remove any dead stems that become detached from their bases.
Alliums are hardy and can therefore be left in the ground all year round.
Keep an eye out for any diseased foliage.
Seldom need support.

£7.50

Allium Millenium

Ornamental Onions

3 Roots £7.50
5 Roots £12.00
10 Roots £22.50

Qty Out of stock

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Flowering Period: July

Specification

Also known as:

Ornamental Onions

Planting period:

Autumn

Height:

40-50 cm / 16-20"

Border position:

Middle/Back

Aspect:

Full sun

Soil type:

Loam, Sandy, Clay, Multipurpose Compost

Soil acidity:

Any

Bulb size:

Size 1

Hardiness:

Hardy - H5 (-10°C to -15°C)

Suitable for containers:

Yes

Scented:

Double flowered:

Pollinator:

Yes

Toxicity:

Skin/eyes irritant

Delivery period:

Spring (Feb to May 2026)

SKU

harts111411

Description

Just when you think the allium season is over, Allium ‘Millenium’ steps in to steal the show! This late-flowering perennial brings a fresh burst of colour to the garden right when other alliums have faded, producing vibrant rosy-pink pom-pom blooms from mid to late summer.

Unlike traditional alliums, ‘Millenium’ is a true perennial, forming neat, compact clumps of glossy green foliage topped with tidy, rounded flower heads. One of its standout features is that it blooms while still in full leaf, creating a lush, well-rounded look that's perfect for borders, containers, and wildlife-friendly planting schemes.

Extremely hardy, low-maintenance, and reliably perennial, Allium ‘Millenium’ returns year after year with minimal fuss. Over time, it forms larger clumps, creating an increasingly impressive display that bees, butterflies, and other pollinators absolutely adore.

Whether planted in masses for a dramatic swathe of colour or tucked into mixed beds for added texture and height, ‘Millenium’ adds beauty and biodiversity to any garden.
Additional Information

For more information on planting and growing Alliums.