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Vegetable · Fabaceae family

Scarlet runner bean

Phaseolus coccineus

Full sun 7 ft 10½ in–11 ft 9¾ in × 2 ft 11⅜ in–4 ft 11 in Harvest July–September Moderate care

In short a 10-second read

SunFull sun
Size7 ft 10½ in–11 ft 9¾ in
spacing 7¾ in
Water~2.16 qt/sq ft
a week in a dry summer
SowingMay–June
HarvestJuly–September
Care levelModerate care
Do not eat raw bean pods and seeds.

Where to plant and how much to water

Sun, soil and water.

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

Sun

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

Soil

tolerates any pH
acidicneutralalkaline
average to moistclayhumus-richloamy

Watering

Scarlet runner bean — Watering
~2.16 qt/sq fta week in a dry summer
more when fruitingonly in dry spellsless when it rains

How much space it takes

Mature size.

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

3 ft 3⅜ in6 ft 6¾ in9 ft 10⅛ in7 ft 10½ in–11 ft 9¾ inspread 2 ft 11⅜ in–4 ft 11 in
7 ft 10½ in–11 ft 9¾ in× spread 2 ft 11⅜ in–4 ft 11 in

Plant 7¾ in apart.

How to plant: next to a support, 7¾ in in the row, 19¾ in between rows

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

Sowing: JanuarySowing: FebruarySowing: MarchSowing: AprilSowing: MaySowing: JuneSowing: JulySowing: AugustSowing: SeptemberSowing: OctoberSowing: NovemberSowing: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberHarvest: JanuaryHarvest: FebruaryHarvest: MarchHarvest: AprilHarvest: MayHarvest: JuneHarvest: JulyHarvest: AugustHarvest: SeptemberHarvest: OctoberHarvest: NovemberHarvest: DecemberCheck: JanuaryCheck: FebruaryCheck: MarchCheck: AprilCheck: MayCheck: JuneCheck: JulyCheck: AugustCheck: SeptemberCheck: OctoberCheck: NovemberCheck: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
SowingFeedingHarvestCheck
Now, in October: nothing to do — the next job is in May.
JanFebMarAprMayJunJulAugSepOctNovDec

Sowing

JanFebMarAprMayJunJulAugSepOctNovDec

direct sowing: May–June

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

May

Harvest

JanFebMarAprMayJunJulAugSepOctNovDec

July–September

Check

JanFebMarAprMayJunJulAugSepOctNovDec

May–August: Check the shoot tips of legumes for black aphids and pinch out the tops.

Feeding

Nutrition.

Scarlet runner bean — Feeding
Horn meal

up to 0.16 oz/sq ft · in 1 dose · May

JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

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

What you will see

Black aphids on shoot tips; growth is poorer and fewer pods form, but the pulses themselves are usually undamaged.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
May–August

How to protect

  1. Prevention
    • Tolerate them to some extent: damage is usually small.
    • Encourage ladybirds, hoverflies, lacewings and parasitic wasps.
  2. By hand April to AugustPinch off affected tips or squash colonies with your fingers.
  3. Chemical — only when nothing else helps according to the product labelLast resort only: a product authorized in your country against aphids. Try non-chemical methods first.
Black bean aphid (blackfly)pest · May–August

What you will see

Black aphids on shoot tips; growth is poorer and fewer pods form, but the pulses themselves are usually undamaged.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
May–August

How to protect

  1. Prevention
    • Tolerate them to some extent: damage is usually small.
    • Encourage ladybirds, hoverflies, lacewings and parasitic wasps.
  2. By hand April to AugustPinch off affected tips or squash colonies with your fingers.
  3. Chemical — only when nothing else helps according to the product labelLast resort only: a product authorized in your country against aphids. Try non-chemical methods first.
More about this problem
Runner and Green bean rust

Runner and Green bean rust

Uromyces appendiculatus
disease

What you will see

Brown, black or white spore pustules on leaves, stems or pods.

When to look

Summer

How to protect

  1. Prevention
    • The disease appears mainly later in the season (after midsummer) and often does not reduce the crop.
    • Pick off affected leaves straight away (affected older leaves first).
    • After harvest, collect and dispose of all remains.
  2. By hand from midsummerRemove heavily infested plants; dispose of the remains.
Runner and Green bean rustdisease · summer

What you will see

Brown, black or white spore pustules on leaves, stems or pods.

When to look

Summer

How to protect

  1. Prevention
    • The disease appears mainly later in the season (after midsummer) and often does not reduce the crop.
    • Pick off affected leaves straight away (affected older leaves first).
    • After harvest, collect and dispose of all remains.
  2. By hand from midsummerRemove heavily infested plants; dispose of the remains.

What you will see

Speckled leaves and early leaf drop.

When to look

Outdoors in summer, especially in hot, dry weather

How to protect

  1. Prevention
    • Plants in a hot, dry, overcrowded greenhouse suffer more: increase humidity and airflow.
    • In fall, remove heavily infested plants and clear away debris, canes and ties; disinfect the greenhouse thoroughly.
    • Weed around the greenhouse; weeds are hosts.
  2. Biological March to OctoberPredatory mites (from a biological control supplier) are the most common biological control against spider mites.
  3. Chemical — only when nothing else helps according to the product labelLast resort only: a product authorized in your country against mites. Try non-chemical methods first.
Two-spotted spider mitepest · outdoors in summer, especially in hot, dry weather

What you will see

Speckled leaves and early leaf drop.

When to look

Outdoors in summer, especially in hot, dry weather

How to protect

  1. Prevention
    • Plants in a hot, dry, overcrowded greenhouse suffer more: increase humidity and airflow.
    • In fall, remove heavily infested plants and clear away debris, canes and ties; disinfect the greenhouse thoroughly.
    • Weed around the greenhouse; weeds are hosts.
  2. Biological March to OctoberPredatory mites (from a biological control supplier) are the most common biological control against spider mites.
  3. Chemical — only when nothing else helps according to the product labelLast resort only: a product authorized in your country against mites. Try non-chemical methods first.
More about this problem
Runner beans: failure to set pods

Runner beans: failure to set pods

physiological disorder

What you will see

The beans flower but pods do not set.

When to look

Especially at flowering in early summer

How to protect

  1. Prevention
    • Watering: lack of water is a common cause; picking young pods repeatedly encourages further setting.
    • Unfavourable weather, insects or birds also reduce setting.
Runner beans: failure to set podsphysiological disorder · especially at flowering in early summer

What you will see

The beans flower but pods do not set.

When to look

Especially at flowering in early summer

How to protect

  1. Prevention
    • Watering: lack of water is a common cause; picking young pods repeatedly encourages further setting.
    • Unfavourable weather, insects or birds also reduce setting.

What you will see

Irregular holes in soft leaves and young shoots and slime trails; they feed at night.

How to protect

  1. Prevention
    • Plant sturdy potted plants, not delicate young seedlings.
    • Water in the morning, not the evening (evening watering helps them move around).
    • Encourage their natural enemies: birds, hedgehogs, toads, ground beetles.
  2. By hand evening, after rainPick them off by hand on damp evenings and take them far away. Traps: hollowed-out citrus halves placed cut side down, or sunken containers of beer; check in the morning.
  3. Biological when the soil is warm and moistSlug-specific nematodes (from a biological control supplier) are watered into the soil.
  4. Chemical — only when nothing else helps according to the product labelLast resort only: a product authorized in your country against slugs and snails. Try non-chemical methods first.
Slugs and snailspest

What you will see

Irregular holes in soft leaves and young shoots and slime trails; they feed at night.

How to protect

  1. Prevention
    • Plant sturdy potted plants, not delicate young seedlings.
    • Water in the morning, not the evening (evening watering helps them move around).
    • Encourage their natural enemies: birds, hedgehogs, toads, ground beetles.
  2. By hand evening, after rainPick them off by hand on damp evenings and take them far away. Traps: hollowed-out citrus halves placed cut side down, or sunken containers of beer; check in the morning.
  3. Biological when the soil is warm and moistSlug-specific nematodes (from a biological control supplier) are watered into the soil.
  4. Chemical — only when nothing else helps according to the product labelLast resort only: a product authorized in your country against slugs and snails. Try non-chemical methods first.
More about this problem
Sources (6)

Bed neighbors

Good and bad neighbors.

Each neighbor shows how we know it.

✓Good neighbors

✕Bad neighbors

Frequently asked

Quick answers.

When do I sow scarlet runner bean?

In May–June (direct sowing).

When is scarlet runner bean harvested?

In July–September.

Does scarlet runner bean tolerate shade?

No, it needs full sun.

How much space does scarlet runner bean need?

At maturity 2 ft 11⅜ in–4 ft 11 in wide and 7 ft 10½ in–11 ft 9¾ in tall; recommended spacing 7¾ in.

Black bean aphid (blackfly) — what can you do?

Tolerate them to some extent: damage is usually small. Pinch off affected tips or squash colonies with your fingers.

Runner and Green bean rust — what can you do?

The disease appears mainly later in the season (after midsummer) and often does not reduce the crop. Remove heavily infested plants; dispose of the remains.

Sources (7) Checked 27 October 2026

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