Runner beans (Phaseolus coccineus)
13 sources cited · Verified
The short answer
- Site
- 6+ hours of sun
- Biggest risk
- Bean rust
Runner beans (Phaseolus coccineus) — tender annual.
This crop carries an unusually heavy problem load: 3 diseases, 13 pests and 0 nutrient issues are documented for it, so most of the effort in growing it well goes into prevention.
Core growing advice on this page is checked against named horticultural and university-extension sources — see References.
Diseases
Pests
Quick Facts
| Factor | Value |
|---|---|
| Sunlight | 6-10 hours direct sun |
| Germination temp | 10C |
| Optimal growing temp | 12-26C |
| Minimum survivable temp | 5C |
| Soil texture | RHS: fork in "lots of home-made garden compost or well-rotted manure - at least two bucketfuls per square metre/yard". Neither source states a soil texture requirement. |
| Drainage | RHS: a "sunny, sheltered position". |
| Lifecycle | tender annual; frost will damage plant tissue |
| Edible parts | pods |
At a Glance
Soil & Growing Conditions
Water: RHS: "regular watering is usually required, especially once they start to flower and form pods"; containers require "frequent and generous watering". Univ. of Maryland: "Keep the root zone moist by watering deeply and regularly during dry periods. Water more frequently when pods begin to develop". RHS gives a specific volume for pod set: water "giving 5-11 litres per sq m (1.1-2.2 gallons per 10 sq ft) twice a week"; "Lack of moisture at the roots" is the first listed cause of failure to set pods.
Growth Stages
| Stage | BBCH | Notes |
|---|---|---|
| Sowing & germination | 0 | Sow 5cm deep. Seed needs soil of at least 12C to germinate and will not survive frost, so it is usually started indoors mid-April to May and planted out only after the last frost. RHS. |
| Establishment & support | 3 | Two seeds sown at the base of each cane outdoors, thinned to one. Climbing types need a support such as a double row of 2.5m canes with 45-60cm between the rows and plants 15-30cm apart within each row; dwarf varieties need only 30cm between plants and 50cm between rows. RHS. |
| Flowering & pod set | 6 | Cropping begins around midsummer. RHS. |
| Cropping | 8 | Continues for eight weeks or more provided pods are picked regularly, ideally every two to three days, while young, tender and stringless at about 20-25cm long. Letting pods mature stops the plant flowering and producing any more. RHS. |
Harvest & Storage
When to pick: RHS: pick pods "young, tender and stringless, about 20-25cm (8-10in) long. The pods should snap easily and the beans inside should still be small and pale in colour."
Storage
Univ. of Maryland: store beans "In a perforated plastic bag in the refrigerator for up to one week. Beans freeze well". RHS states no storage method.
Companion Planting
Pollination
Pollinating insects (bees and other flower visitors)
RHS: runner beans depend on "pollinating insects" and bees to set pods. Causes of failure to set include "Lack of pollinating insects, perhaps because of cold, wet or windy weather" and "Very hot weather, especially at night, which inhibits the germination of pollen grains". Also listed: lack of moisture at the roots; acid soils below pH 6.5; "Nectar-robbing bumblebees" (noted as having "very limited effect"); "Birds, especially house sparrows, which peck at the flowers"; and infrequent harvesting -- "it is important to pick beans every two or three days, otherwise the pods will start to swell and set seed, which inhibits further pod production". Remedies: plant in a sheltered site to encourage bees, add organic matter, lime if pH is below 6.5, mulch, and on hot days water well in the morning and sometimes the evening to cool the plants. IMPORTANT NEGATIVE FINDING -- RHS: "Don't mist or spray the flowers with water (as used to be advocated) as this has not been shown to help pod-set and may deter bees."
Runner Beans, Cane to Pod
References
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Tier 1. Carries action thresholds rather than only descriptions: three thrips per flower may interfere with pollination and cause defectively shaped pods; corn earworm warrants treatment at 5% damaged pods or one larva per 3 ft of row; tarnished plant bug at one bug per 6 ft of row; stink bugs at one per 10 ft on snap beans and one per 15 ft on lima beans, which are more sensitive. Mexican bean beetle completes egg-to-adult in about a month with three generations a year, and Wade and Black Valentine are resistant or tolerant. Lesser cornstalk borer causes 30-50% stand loss on late plantings after 1 July on sandy soil in hot dry conditions. Spider mites can complete a generation in as few as eight days in hot dry weather.
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13 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
What problems affect runner beans?
Our data links 3 diseases and 13 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.
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Last verified 2026-08-06
Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.