Yardlong Bean Plants: Growing Asparagus Beans


Growing a yardlong bean must be part of your backyard plans. Named for his or her dimension, yardlong beans can develop as much as 3 ft lengthy (though the common dimension is a half-yard). Because they’re a vining plant that grows vertically, they’re an excellent selection for gardeners who don’t have numerous room. Because of their dimension and abundance throughout harvest time, you’ll possible have yardlong beans to eat all year long. Yardlong beans develop nicely in most climates, making them a superb selection for a beginner’s backyard.

There is so much that may be completed to organize yardlong beans. These greens style nice cooked or uncooked. They’re the proper factor to develop for these seeking to get inventive within the kitchen. Chopped up uncooked, they’re an excellent addition to salads. Whether sauteeing, grilling, or making stir-fried longbeans, including slightly warmth will intensify their taste. Some desire the yardlong bean to inexperienced beans when a soup or stew requires them as they don’t get as soggy. 

Unlike inexperienced beans, yardlong beans are higher ready with oil than water, making them the proper addition to stir-fried dishes. Yardlong beans will be traced again to elements of Asia and are a typical ingredient amongst Chinese dishes, particularly dry-fried inexperienced beans with a splash of soy sauce. Some desire the less complicated strategy of sauteeing them in garlic and butter. They are an excellent supply of fiber, vitamin C, iron, and vitamin A. 

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Quick Care Guide

The yardlong bean plant produces elongated, scrumptious beans. Source: Starr
Common Name(s) Yardlong bean, asparagus bean, snake bean, Chinese lengthy bean
Scientific Name Vigna unguiculata subsp. sesquipedalis
Days to Harvest 70-90
Light Full solar
Water 1-2 inches of water per week
Soil Well-draining, loamy soil
Fertilizer Minimal; compost is ok
Pests Aphids, thrips, worms, caterpillars
Diseases Bacterial blight, powdery mildew

All About The Yardlong Bean

Red Noodle Beans
Red noodle beans are a sort of yardlong bean. Source: Thomas Cizauskas

The yardlong bean, also called Vigna unguiculata subsp. sesquipedalis, is a vine plant grown for its edible pods and is much like a inexperienced bean. Despite their identify, yardlong beans are literally a wide range of cowpea and are extra carefully associated to peas than beans. They can often develop as much as 3 ft lengthy, however it is strongly recommended to reap them nicely earlier than they attain that time. Sometimes known as Chinese lengthy beans, these originated in southern China and Southeast Asia. Along with the names yardlong bean and Chinese lengthy bean, folks additionally name them snake beans and asparagus beans.

Chinese lengthy beans have climbing vines from which emerge flowers and pods. The flowers will be lavender, pink, or white, relying on the variability. Like many of the legume household, they’re nice at pulling nitrogen from the air and including extra fertility again to the bottom. But most individuals particularly develop them to allow them to eat their lengthy pods. 

Yardlong beans are usually planted within the spring as soon as the bottom is heat. The seeds will emerge in 10 to 14 days, and after about an 80 day rising season, beans will be harvested and eaten, cooked in a stir fry, or saved to eat all year long. 

Types of Yardlong Beans

There are a few completely different kinds of asparagus beans, and they’re all extraordinarily completely different from one another and the basic asparagus bean. 

  • Stickless Wonder: This is the one one which produces bush beans of all of the yardlong varieties. As a bush bean, this bean doesn’t want any type of trellis or assist, however utilizing a stake to supply reinforcement when it’s windy could also be helpful. It additionally has a shorter rising season however can pod out a lot faster at 55 days. 
  • Chinese Red Noodle: These Chinese lengthy beans are a gorgeous maroon colour that stays with them even when cooking. They are primarily chosen for look causes as they’ve an identical recent style to different asparagus beans. This selection takes 80-90 days to succeed in maturity. 
  • Liana: An early maturing asparagus bean that grows on lengthy vines. It is a day-neutral plant, which means it’ll flower whatever the quantity of daylight it receives. This selection could also be an excellent choice for these involved about assembly the complete daylight wants of most yardlong beans. 

Planting Yardlong Beans

Choosing the place to develop asparagus beans is important to the general success of your crop. Pick a spot with loads of mild. Growing yardlong beans within the shade could delay flowering in your vegetation, thus guaranteeing fewer beans to reap. Skip rising beans in the identical soil that any legumes grew within the earlier yr. Crop rotation means that you can use the additional nitrogen they supply to the soil for rising different plant sorts.

Asparagus beans can develop 8-12 ft tall and can want some type of vine assist or trellis. You can also develop asparagus beans alongside a fence for assist. Whatever you select to make use of for assist ought to already be current and firmly in place when planting yardlong bean seeds. 

If you plant asparagus beans in containers, be sure the containers are not less than 10 inches deep. Make positive that the potting media will not be compacted and is definitely penetrated, because the roots in your vines can simply attain 10 inches deep. A small quantity of compost can also be combined in earlier than planting.

The greatest planting time for rising yardlong beans is within the spring after the ultimate frost. The soil temperature must be not less than 65 levels to germinate however to develop asparagus beans which can be very wholesome, they’ll germinate even higher at 75 levels. 

Asparagus bean seeds needs to be sown immediately into the soil, as they don’t deal with transplanting nicely. Plant seeds 1 inch deep and 3-4 inches aside. Once you’ve completed planting time and your seedlings emerge, skinny them to 6-8 inches aside. It is really useful to coat the seeds in a soil inoculant earlier than planting to maximise their nitrogen-boosting capabilities later. Water instantly after planting. 


Young yardlong beans
Young asparagus beans will develop to towering heights. Source: scholz

While the Chinese lengthy bean within reason straightforward to develop, asparagus beans do require sure situations to thrive. Once you’ve got a trellis in place and your bean seeds are planted, it’s time to organize for correct care.

Sun and Temperature

Growing yardlong beans is straightforward in heat climates, however they are often grown in cooler temperature areas as nicely. Before planting seeds, the soil needs to be not less than 65 levels and the plant does its greatest rising as soon as exterior temperatures constantly hit the 70-80 diploma vary. Chinese lengthy bean additionally wants full solar. Decreasing the solar or temperature will end in fewer beans, and those who do develop can have harder pores and skin and never nearly as good high quality of the bean. 

The asparagus bean will be grown by anybody in USDA zones 2-9. Pay consideration to native temperatures to know if frost blankets are wanted to guard towards cool climate. If the temperature drops under 50 levels for lengthy durations of time, you run a threat of damaging your crop, though brief bursts of cooler climate are high quality. These carry out nicely all through the summer season months, and summer season warmth doesn’t appear to section them a lot so long as they’ve ample moisture. It is really useful to use mulch as soon as your plant has been established to maintain the soil from drying out rapidly. 

Water and Humidity

Yardlong beans are pretty drought-tolerant, however going too lengthy with out water will make the beans powerful and shorter. They desire a constant watering schedule.

To develop asparagus beans, they sometimes want one to 2 inches of water per week. Water on the base of your plant to stop illness from spreading. Watering within the morning is greatest. Use a soaker hose or drip irrigation to maintain moisture off the plant’s leaves.

Water the seed of your yardlong beans each different day till they germinate. Once they’ve germinated, proceed to water them 2-3 occasions every week. Once established, an inch of water per week is satisfactory, though scorching summer season days could imply extra frequent watering.


The rising media for Vigna unguiculata subsp. sesquipedalis have to be well-draining. It is greatest to go together with unfastened, aerated, loamy soil. The yardlong bean can tolerate acidic soils however does greatest when it’s within the 5.5-7.5 pH vary.

To enhance the fertility of your soil, you possibly can add a slight quantity of compost within the spring (2-3 inches price), nevertheless it’s not needed. 


Usually, fertilizing yardlong beans is non-compulsory and principally pointless. Like most legumes, they take up nitrogen within the air after which repair it within the soil through their roots. They are nice soil builders however will be delicate to over-fertilization with nitrogen. If you resolve to make use of fertilizer, select one which focuses extra on phosphorous and potassium moderately than nitrogen. This will present extra flowers, and later a pod with higher taste and texture.


Yardlong beans are pole beans, and so they want one thing to climb on. A trellis is really useful. Make positive it’s in place while you plant your beans to allow them to discover it as they develop and start climbing. 

Yardlong beans will develop the whole size of your poles, so be sure to not make them greater than you possibly can attain, otherwise you won’t be able to reap your entire beans. It is really useful that your assist construction be about 7 ft in peak. You will nonetheless be capable to harvest beans grown on the high as a result of they’re so lengthy and cling from the vines. 


Grow asparagus beans from seed. You can have essentially the most success planting immediately into the bottom, and seedlings emerge in a short time. Transplanting will not be really useful as these have delicate roots, though it may be completed for those who’re cautious. Yard lengthy beans don’t propagate nicely through different strategies.

Harvesting and Storing

Harvested yardlong beans
A batch of harvested yardlong beans at market. Source: gtrwndr87

While you could sit round and calm down all summer season ready in your beans, harvest season received’t be as stress-free, however it’s enjoyable! The yardlong beans develop 1-2 inches per day till they develop into mature pods. Because of their fast progress, you will want to reap day by day.


Somewhat over two months after you’ve got planted your asparagus beans, it’s time for harvesting! The beans are prepared to choose when they’re about as thick as a pencil and about 18 inches lengthy. Despite their identify, they hardly ever attain a yard lengthy; a half yard is common and is rather more widespread than a full yard lengthy bean. The beans ought to snap when bent. Once selecting season begins, you’ll most certainly have to choose beans day by day to make sure steady progress and lengthen your season. If a bean is left to ripen on the vine, that plant could cease producing new beans, so it’s necessary to maintain selecting your backyard commonly!

Growing yardlong beans sometimes produce not less than two beans at a time in every flower cluster. When harvesting, you possibly can maintain the plant on the base of the 2 beans and twist them off, or you possibly can snip the bean off the plant near the bottom. Make positive when slicing that you don’t minimize above the node. Doing so will cease additional nodes from forming and halt bean manufacturing in that particular location.

If the beans are pale inexperienced, yellow, or white, you’ve got waited too lengthy to reap, and it might be greatest to go away these vegetation to supply dried beans for seeds for subsequent yr. Harvest your final dry pods earlier than the primary frost hits to stop them from being broken. You can then take away the seeds from the pods and totally dry them for storage.

The beans are greatest eaten proper after harvesting, however there are just a few methods to organize and retailer them as nicely. 


Asparagus beans will final about 4 days after being picked. To forestall them from creating rusty patches, be sure to maintain these greens in a moist, cool place. Putting the pods in a baggie with a moist paper towel inside your vegetable crisper with excessive humidity offers you one of the best outcomes. 

While yardlong beans don’t have the longest shelf life, there are various alternative ways to organize and retailer them in an effort to get essentially the most out of your harvest. 

A preferred choice is storing them within the freezer. To do that, you’ll minimize off the ends of the beans, minimize them to your required dimension, blanch them in boiling water for 30-60 seconds, then pressure, pat dry, and bag. If you need to be sure they don’t stick collectively within the bag, lay them on steel cookie sheets well-separated from each other and freeze them earlier than bagging. Frozen asparagus beans can last as long as a yr within the freezer with out shedding taste.

Canning can be a superb choice for asparagus beans. You can them the identical means you’d another inexperienced bean or pickle them. Remember, as a low-acid meals, your harvested yard lengthy beans will must be ready in a stress canner. Water bathtub strategies should not food-safe and will be harmful. 

Along with canning, they will also be freeze-dried or dehydrated for a wholesome snack. You would observe the identical directions in prepping asparagus beans the identical means you’d another inexperienced bean or different legumes, however can chop up your beans to smaller, extra manageable sizes.


Vigna unguiculata subsp sesquipedalis
Vigna unguiculata subsp. sesquipedalis vines can get enormous. Source: Tony Rodd

This stunning climbing plant does include its downsides. Fortunately, the issues you may face when rising yardlong beans are widespread gardening points, and you almost certainly are already outfitted with the instruments you have to deal with them. 


There are just a few widespread pests that may affect your yard lengthy beans.

Aphids love beans, and asparagus bean isn’t any exception. They are additionally inclined to thrips and spider mites. Luckily, these can all be handled equally. Spray vegetation early within the day with water to knock them off vegetation. Regularly spraying neem oil or insecticidal cleaning soap will even cut back these bugs in your backyard. If you’ve got a extreme outbreak, an natural pyrethrin spray is efficient as nicely.

Slugs additionally love asparagus beans, and eliminating them is a little more labor-intensive. The tried and true methodology of eradicating them by hand and placing them in a bucket of soapy water is efficient, however an natural slug and snail bait could also be simpler than wandering the backyard at evening on the lookout for slugs. If not managed, slugs will eat the leaves all the way down to virtually nothing and might chew by way of the vines.

Some varieties of caterpillars additionally like to chew in your beans. These backyard annoyances reply extraordinarily nicely to BT spray therapies. BT, or Bacillus thuringiensis, is a pure micro organism present in soil that can trigger caterpillars to cease feeding and finally starve them to loss of life. 


If you begin seeing white, powdery spots on the stems of your asparagus bean vegetation, likelihood is you’ve got powdery mildew. While that is annoying, it isn’t the tip of the world; this white mildew is a quite common plant illness. It’s attributable to a fungus, and so an antifungal remedy like neem oil is an effective start line. For extra extreme outbreaks, you possibly can attempt a copper-based fungicide. Remove essentially the most severely mildew-damaged leaves, throwing them away. Don’t compost materials that’s contaminated to keep away from spreading the spores to your compost bin.

You can inform in case your asparagus beans have developed bacterial blight if the pods have brown spots and wilted foliage (a yellow halo usually surrounds the brown spots). Blight happens throughout damp and funky temperatures and sometimes will be unfold through aphids or different pests. Avoid overwatering your vegetation to cut back the humidity round them throughout cool climate, and preserve bugs away out of your backyard to cut back the chance to your vines. 

If you discover that your plant has blight, we advocate utilizing a copper fungicide or a sulfur fungicide. Neem oil may assist forestall blight and deter aphids, spider mites, and different pests. With it’s varied advantages, if you’re rising asparagus beans, some kind of neem oil needs to be in your arsenal.

Frequently Asked Questions

Beans and cucumbers
Asparagus beans and cucumbers. Source: sgcrawf

Q: What do yardlong beans style like?

A: Yardlong beans style much like inexperienced beans however are slightly extra grassy. They aren’t as candy as a inexperienced bean both, and a few say they’ve a barely acidic style. When you prepare dinner them, they develop a extra agency and chewy texture, together with a nutty style.

Q: Can you eat yardlong beans uncooked?

A: Yes! Yardlong beans will be eaten uncooked or cooked. 

Q: Where do yardlong beans develop?

A: Yardlong beans can develop in most elements of the US. They want three months of sunny, heat temperatures (65-75 levels) and locations the place they will get solar all day.

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