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Raised garden bed I – solid 2⅜ in European larchRaised garden bed IRaised garden bedsRaised garden bed L – solid 2⅜ in European larchRaised garden bed LRaised garden bedsRaised garden bed U – solid 2⅜ in European larchRaised garden bed URaised garden bedsBed I with bench – solid 2⅜ in European larchBed I with benchRaised garden bedsBed L with bench – solid 2⅜ in European larchBed L with benchRaised garden bedsSolid bench – solid 2⅜ in European larchSolid benchSeatingPedestal bench – solid 2⅜ in European larchPedestal benchSeatingBench with planter – solid 2⅜ in European larchBench with planterSeatingGarden table – solid 2⅜ in European larchGarden tableSeatingTable and two benches – solid 2⅜ in European larchTable and two benchesSeatingSandbox with seating – solid 2⅜ in European larchSandbox with seatingFor kidsGarden steps – solid 2⅜ in European larchGarden stepsSlope & terrace

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Choose your climateBased on winter hardiness only.

Bulb · Amaryllidaceae family

Giant ornamental onion

Allium giganteum

Full sun 2 ft 11⅜ in–4 ft 11 in × 1 ft 5¾ in–1 ft 11⅝ in Flowers June–July to −84 °F
Flower colors Click a color

In short a 10-second read

SunFull sun
Size2 ft 11⅜ in–4 ft 11 in
spacing 22¾ in
FlowersJune–July
PlantingSeptember–November
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun, in average soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
averageloamysandyclay

Watering

only in dry spellsless when it rains

Frost

−84 °F
no winter protectiondies back in winter, regrows in spring

How much space it takes

Mature size.

The mature plant next to a person (69 in).

19¾ in3 ft 3⅜ in4 ft 11 in2 ft 11⅜ in–4 ft 11 inspread 1 ft 5¾ in–1 ft 11⅝ in
2 ft 11⅜ in–4 ft 11 in× spread 1 ft 5¾ in–1 ft 11⅝ in

Plant 22¾ in apart.

Reaches maturity in about 2–5 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Typical for a temperate climate (four seasons). The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlanting
Now, in October: a good time for planting (bulb).
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

June–July · purple

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

bulb: September–November

What to plant now (October) full list in October (243) →

Feeding

Nutrition.

Light
high-potash fertilizer

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level

Onion white rot

Stromatinia cepivora
High riskdisease
More about this problem

What you will see

Yellowing leaves, white mycelium on the bulb.

The source says: it is a serious disease of the onion family.

How to protect

  1. Prevention
    • Do not repeat alliums in the same place.
  2. By hand once noticedDig up affected plants.
Onion white rotdiseaseHigh risk

What you will see

Yellowing leaves, white mycelium on the bulb.

The source says: it is a serious disease of the onion family.

How to protect

  1. Prevention
    • Do not repeat alliums in the same place.
  2. By hand once noticedDig up affected plants.
More about this problem

What you will see

Streaks of pale spots in leaves.

How to protect

  1. Prevention
    • Cover with mesh in spring.
  2. By hand springRemove affected leaves; peat when planting.
Allium leaf minerpest

What you will see

Streaks of pale spots in leaves.

How to protect

  1. Prevention
    • Cover with mesh in spring.
  2. By hand springRemove affected leaves; peat when planting.
More about this problem

What you will see

Larvae eat the onions.

How to protect

  1. Prevention
    • Cover with mesh.
  2. By hand once noticedRemove affected bulbs.
Onion flypest

What you will see

Larvae eat the onions.

How to protect

  1. Prevention
    • Cover with mesh.
  2. By hand once noticedRemove affected bulbs.
More about this problem
Onion downy mildewdisease

What you will see

Yellowing leaves, gray-purple mold.

How to protect

  1. Prevention
    • Airy spacing.
  2. By hand once noticedRemove affected parts.
More about this problem
Sources (4)

What to combine it with

Same needs, different flowering.

They share the same sun and soil and flower in other months — so the bed flowers for longer.

Bluebeard

Bluebeard

2 ft–3 ft 3⅜ in
✓flowers July–October
✓lower — for the front
garden chrysanthemum

garden chrysanthemum

11¾ in–2 ft 11⅞ in
✓flowers September–October
✓lower — for the front
garden cosmos

garden cosmos

11¾ in–3 ft 11¼ in
✓flowers June–October
✓lower — for the front

Frequently asked

Quick answers.

When does giant ornamental onion flower?

In June–July; the flowers are purple.

Does giant ornamental onion tolerate shade?

No, it needs full sun.

How much space does giant ornamental onion need?

At maturity 1 ft 5¾ in–1 ft 11⅝ in wide and 2 ft 11⅜ in–4 ft 11 in tall; recommended spacing 22¾ in.

Allium leaf miner — what can you do?

Cover with mesh in spring. Remove affected leaves; peat when planting.

Onion fly — what can you do?

Cover with mesh. Remove affected bulbs.

Sources (17) Checked 20 October 2026

Similar plants

Have a look at these too.

dahlia

Dahlia ×pinnata

11¾ in–6 ft 2¾ in × 11¾ in–2 ft 11⅜ in
Demandingbulb
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