How to Grow Yardlong Beans
On this page
Yardlong beans are ready to harvest 75 days after planting.
Yardlong beans (Vigna unguiculata subsp. sesquipedalis) — annual.
The short answer
- 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
At a Glance
Quick Facts
Soil & Growing Conditions
Growth Stages
Harvest & Storage
Diseases
Pests
Plan your Yardlong Beans planting
Timing for Yardlong Beans follows soil temperature and frost, not the calendar date. The Global vegetable planting calendar explains the method. 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.
Sources
These source is specific to this region. The full list of 6 sources behind this guide (Garden Organic, GBIF, NC State Extension and others) is in the references of our UK guide to yardlong beans; they describe the plant itself, which is the same wherever it grows.
Frequently Asked Questions
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
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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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 international horticultural research and extension sources. 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
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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.