How to Grow Yardlong Beans UK
On this page
- Yardlong Bean (Vigna unguiculata subsp. sesquipedalis)
- When to Plant Yardlong Beans in the UK
- Quick Facts
- At a Glance
- Soil & Growing Conditions
- Growth Stages
- Harvest & Storage
- Diseases
- Pests
- Yardlong Bean, the Climbing Cowpea With Half-Metre Pods
- Plan your Yardlong Beans planting
- Growing Yardlong Bean in another region
- References
- Frequently Asked Questions
In the UK, yardlong beans go in the ground mid April to early June, and are ready to harvest 75 days after planting.
Timing is the decision that matters most in the UK: sowing mid April, and that same window applies across all 4 regions covered here.
The short answer
- Plant
- Mid April to early June
- Ready in
- 75 days
- Site
- 6+ hours of sun, soil pH 5.5–6.5
- Biggest risk
- Powdery mildew
Core growing advice on this page is checked against named horticultural sources — see References.
Yardlong Bean (Vigna unguiculata subsp. sesquipedalis)
Also known as: snake bean, Chinese long bean, asparagus bean · 6 sources cited · Verified
When to Plant Yardlong Beans in the UK
When to plant yardlong beans in the UK: in Southern England, sow mid April to early June. Find your area in the table below.
Quick Facts
At a Glance
Soil & Growing Conditions
Growth Stages
Harvest & Storage
Diseases
Pests
Yardlong Bean, the Climbing Cowpea With Half-Metre Pods
Plan your Yardlong Beans planting
When to sow and plant Yardlong Beans depends on your own frost dates. Check the UK vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.
Growing Yardlong Bean in another region
Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.
References
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RHS explicitly does not recommend pesticide use against aphids; recommends tolerance, manual squashing, and encouraging/purchasing natural predators (ladybirds, hoverflies, lacewings, parasitoid wasps, earwigs) as biological control, especially under glass.
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RHS factsheet on glasshouse red spider mite (two-spotted spider mite), naming tomato and strawberry among the host plants affected under glass or in a polytunnel.
6 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
When should I sow yardlong beans in the UK?
In Southern England, from mid April. In Scotland, wait until mid April. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow yardlong beans?
Sow mid April to early June.
How long do yardlong beans take to grow?
Typically 75 days, depending on cultivar and growing conditions.
What soil pH do yardlong beans need?
A pH of about 5.5–6.5. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect yardlong beans?
Our data links 1 disease and 3 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
Get the UK Garden Planner →Instant PDF download · Written for UK growing conditions
How this guide is put together
The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against RHS and Met Office guidance. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.
Related Problem Guides
Last verified 2026-09-02
Plan Yardlong Beans by month
The months this guide gives for sowing or planting, each with the full list of jobs for that month in the UK:
More from the same group (peas & beans):
Growing advice for your part of the UK
Timing and conditions change a lot inside one country. These guides cover frost dates and growing seasons region by region.
Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Keep going
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.