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Choose your climateBased on winter hardiness only.

Herb · Amaryllidaceae family

Ramsons

Allium ursinum

Full sun to part shade 3⅞ in–1 ft 7⅝ in × 1 ft 7⅝ in–3 ft 3⅜ in Flowers April–June Harvest April–May to −68 °F
Flower colors Click a color

In short a 10-second read

SunFull sun to part shade
Size3⅞ in–1 ft 7⅝ in
spacing 11¾ in
FlowersApril–June
PlantingMarch–May, September–November
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun to part shade, in average to moist soil.

Sun

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

Soil

tolerates any pH
acidicneutralalkaline
average to moistsandyloamyclay

Watering

keep the soil evenly moistless when it rains

Frost

−68 °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 in3⅞ in–1 ft 7⅝ inspread 1 ft 7⅝ in–3 ft 3⅜ in
3⅞ in–1 ft 7⅝ in× spread 1 ft 7⅝ in–3 ft 3⅜ in

Plant 11¾ in apart.

How to plant: in clumps, clumps 6 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: DecemberHarvest: JanuaryHarvest: FebruaryHarvest: MarchHarvest: AprilHarvest: MayHarvest: JuneHarvest: JulyHarvest: AugustHarvest: SeptemberHarvest: OctoberHarvest: NovemberHarvest: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingHarvest
Now, in October: a good time for planting (container plant).
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

April–June · white

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–May, September–November

Harvest

JanFebMarAprMayJunJulAugSepOctNovDec

April–May

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

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 and wilting leaves, rotting roots and onion base.

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

When to look

Midsummer to early fall

How to protect

  1. Prevention
    • You can practically never clean soil once it has white rot: prevent it being introduced (soil on tools and footwear).
    • Do not grow alliums on affected soil.
  2. By hand as soon as it appearsDig up affected plants together with the surrounding soil and dispose of them; no chemical soil treatment is available to gardeners.
Onion white rotdisease · midsummer to early fallHigh risk

What you will see

Yellowing and wilting leaves, rotting roots and onion base.

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

When to look

Midsummer to early fall

How to protect

  1. Prevention
    • You can practically never clean soil once it has white rot: prevent it being introduced (soil on tools and footwear).
    • Do not grow alliums on affected soil.
  2. By hand as soon as it appearsDig up affected plants together with the surrounding soil and dispose of them; no chemical soil treatment is available to gardeners.
More about this problem

What you will see

Discoloured areas on the top of leaves, with a white, gray or purple coating beneath.

When to look

Mainly summer and fall, especially in damp conditions

How to protect

  1. Prevention
    • Do not plant densely; weed so air can circulate.
    • Water in the morning and avoid wetting the leaves in the evening.
    • Rotate crops; soil spores survive.
  2. By hand as soon as it appearsPull off affected leaves and dispose of them (burying, burning, recycling center).
Downy mildewsdisease · mainly summer and fall, especially in damp conditions

What you will see

Discoloured areas on the top of leaves, with a white, gray or purple coating beneath.

When to look

Mainly summer and fall, especially in damp conditions

How to protect

  1. Prevention
    • Do not plant densely; weed so air can circulate.
    • Water in the morning and avoid wetting the leaves in the evening.
    • Rotate crops; soil spores survive.
  2. By hand as soon as it appearsPull off affected leaves and dispose of them (burying, burning, recycling center).
More about this problem
Sources (3)

Frequently asked

Quick answers.

When does ramsons flower?

In April–June; the flowers are white.

When is ramsons harvested?

In April–May.

Does ramsons tolerate shade?

It tolerates part shade (3–6 hours of sun), but not full shade.

How much space does ramsons need?

At maturity 1 ft 7⅝ in–3 ft 3⅜ in wide and 3⅞ in–1 ft 7⅝ in tall; recommended spacing 11¾ in.

Onion white rot — what can you do?

You can practically never clean soil once it has white rot: prevent it being introduced (soil on tools and footwear). Dig up affected plants together with the surrounding soil and dispose of them; no chemical soil treatment is available to gardeners.

Downy mildews — what can you do?

Do not plant densely; weed so air can circulate. Pull off affected leaves and dispose of them (burying, burning, recycling center).

Sources (9) Checked 24 October 2026

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