Yardlong beans grow rapidly on trellises and produce pods that reach surprising lengths in warm summer weather. If you have never grown these fascinating legumes, you are missing out on one of the most productive and fun vegetables for the home garden. These beans are not just a novelty; they are a staple in many Asian cuisines and they taste fantastic when picked young.
Unlike regular bush beans, these climbers need support and they love heat. Once they get going, they produce an abundent harvest that keeps coming for weeks. In this guide, you will learn everything about planting, caring for, and cooking with these long, slender pods.
What Are Yardlong Beans?
Yardlong beans (Vigna unguiculata subsp. sesquipedalis) are also known as asparagus beans, Chinese long beans, or snake beans. They are a close relative of the cowpea or black-eyed pea. The name is a bit of an exaggeration, but the pods can easily reach 18 to 30 inches in length. They are a warm-season crop that thrives in hot, humid climates where regular green beans often struggle.
The plants are vigorous climbers, often reaching 8 to 10 feet tall. The pods hang down in pairs, making them easy to spot and harvest. They have a flavor that is similar to asparagus or green beans, but with a slightly denser texture. They do not get watery when cooked, which makes them perfect for stir-fries.
Why Grow Them Instead Of Regular Beans?
There are several good reasons to choose these over standard green beans. First, they are incredibly heat tolerant. When the temperature hits 90°F, regular beans stop setting fruit, but yardlong beans thrive. Second, they are very productive. A single plant can yield over 100 pods over the season. Third, they are pest resistant compared to other beans, though they have a few specific enemies you will need to watch for.
They are also a great conversation starter in the garden. Neighbors will be amazed when they see the long, twisting pods hanging from the trellis. Plus, they are simple to save seeds from, allowing you to grow them year after year.
Planting Yardlong Beans For Success
Timing is critical with this crop. They are extremely sensitive to cold and will not germinate in cool soil. You must wait until the soil temperature is consistently above 65°F, and ideally above 70°F. In most regions, this means planting two to three weeks after the last frost date. If you plant too early, the seeds will rot in the ground.
Choose a location with full sun, meaning at least 8 hours of direct sunlight. They need well-draining soil with a pH between 6.0 and 7.0. Before planting, work in some compost or aged manure to provide nutrients. They are nitrogen fixers, so they do not need heavy nitrogen fertilizer, but they do appreciate phosphorus and potassium.
Step-By-Step Planting Guide
- Build a trellis: Install a sturdy trellis or teepee before you plant. The vines are heavy when full of pods. A 6-foot tall trellis is the minimum; 8 feet is better. You can use cattle panels, bamboo poles, or netting.
- Soak the seeds: Soak the seeds in water for 2 to 4 hours before planting. This speeds up germination. Do not soak them for more than 6 hours, as they may rot.
- Sow the seeds: Plant seeds 1 inch deep and 3 inches apart. If you are using rows, space the rows 3 feet apart. You can thin them later.
- Water well: Water the soil gently after planting. Keep the soil moist but not waterlogged until the seedlings emerge, which usually takes 7 to 10 days.
- Mulch: Once the seedlings are up, apply a layer of organic mulch to keep the soil cool and retain moisture.
Direct Sowing Vs. Transplanting
These beans have a delicate root system and do not transplant well. It is almost always best to direct sow them into the garden. If you have a short season, you can start them in biodegradable pots, but you must be very careful not to disturb the roots when planting out. Start them only 3 to 4 weeks before you plan to set them out.
They are fast growers, so direct sowing is usually the most reliable method. The vines will quickly catch up to any transplanted starts, so do not worry about losing time.
Yardlong Beans Care And Maintenance
Once your plants are established, they are relatively low maintenance. However, there are a few key tasks that will ensure a heavy harvest. Consistent watering is the most important factor. These plants need about 1 inch of water per week. If they experience drought stress, they will drop their flowers and stop producing pods.
Water deeply and less frequently to encourage deep root growth. Drip irrigation is ideal because it keeps the foliage dry, which helps prevent fungal diseases. Avoid overhead watering in the evening, as this can lead to mildew problems.
Fertilizing For Maximum Yield
Since they are legumes, they produce their own nitrogen. However, giving them a boost of phosphorus and potassium will help with flower and pod production. Use a low-nitrogen fertilizer, like a 5-10-10 formula, when the plants start to flower. Side-dress the plants by working the fertilizer into the soil a few inches away from the stem.
You can also use compost tea as a foliar feed every few weeks. This provides trace minerals and beneficial microbes. Be careful not to over-fertilize with nitrogen, as this will result in lush foliage and very few pods.
Training The Vines
You will need to help the young vines find the trellis. They do not twine as tightly as pole beans, so you may need to tie them loosely with twine or garden tape. Once they start climbing, they will grab on, but they appreciate a little guidance. Check them daily during the rapid growth phase in mid-summer.
As the plants grow, you can pinch out the growing tips when they reach the top of the trellis. This encourages the plant to branch out and produce more side shoots, which leads to more flowers and pods.
Common Pests And Diseases
While these beans are tough, they do have a few common issues. The most notorious pest is the pod borer. This is a caterpillar that burrows into the pods and eats the seeds. You will see small holes in the pods and frass (insect droppings) near the holes. Once they are inside, the pod is ruined.
To manage pod borers, you need to be vigilant. You can spray with Bacillus thuringiensis (Bt) when you see the first signs of damage. You can also pick off and destroy any affected pods to reduce the population. Aphids can also be a problem, but they are usually controlled by beneficial insects like ladybugs.
Dealing With Fungal Issues
Powdery mildew can appear in late summer when nights are cool and humid. It looks like a white powder on the leaves. To prevent it, ensure good air circulation by spacing plants properly. You can also spray with a sulfur-based fungicide or a milk solution (1 part milk to 9 parts water) weekly.
Root rot can occur if the soil is too wet and cold. This is why it is crucial to wait for warm soil before planting. If you have heavy clay soil, consider planting in raised beds to improve drainage.
Harvesting And Storing Your Crop
This is the fun part. The pods grow incredibly fast. Once the flowers are pollinated, the pods will reach full size in about 2 to 3 weeks. You should harvest them when they are about the thickness of a pencil, usually 15 to 20 inches long. Do not wait too long, as they become tough and stringy if left on the vine.
Harvesting frequently encourages the plant to produce more pods. Check your plants every day or two during peak season. Use scissors or pruning shears to cut the pods from the vine, rather than pulling them, which can damage the plant.
How To Store Fresh Pods
Fresh yardlong beans will keep in the refrigerator for about 5 to 7 days. Wrap them in a paper towel and place them in a plastic bag in the crisper drawer. Do not wash them until you are ready to use them, as excess moisture causes them to spoil faster.
They do not freeze as well as regular green beans because they get mushy. If you want to freeze them, blanch them for 2 minutes in boiling water, then shock them in ice water, drain, and pack in freezer bags. They will keep for up to 6 months, but they are best used in soups or stews after freezing.
Delicious Ways To Cook Yardlong Beans
These beans are a staple in Asian cooking. They are perfect for high-heat stir-fries because they hold their texture and do not release a lot of water. They have a satisfying crunch that regular beans lack. You can also steam them, boil them, or grill them.
One of the best ways to cook them is to cut them into 2-inch pieces and stir-fry them with garlic, ginger, and a splash of soy sauce. They also pair well with coconut milk in curries. You can even eat them raw, though they are a bit tough. They are a great addition to a crudité platter if you slice them thinly.
Simple Garlic Stir-Fry Recipe
- Wash and trim the ends of the beans. Cut them into 3-inch lengths.
- Heat a wok or large skillet over high heat. Add 2 tablespoons of oil.
- Add 4 minced garlic cloves and 1 tablespoon of grated ginger. Stir-fry for 30 seconds.
- Add the beans and stir-fry for 3 to 4 minutes until they are bright green and slightly blistered.
- Add 2 tablespoons of soy sauce and 1 teaspoon of sesame oil. Toss to coat.
- Cook for another 2 minutes until the sauce is absorbed. Serve hot.
You can also add some chili flakes or a splash of rice vinegar for extra flavor. This dish comes together in under 10 minutes, making it a perfect weeknight side dish. The beans will be tender but still have a nice bite to them.
Frequently Asked Questions
How long does it take for yardlong beans to produce?
They typically take about 60 to 80 days from planting to first harvest. The exact time depends on the temperature and the specific variety. Once they start, they produce continuously for several weeks.
Can I grow yardlong beans in a container?
Yes, you can grow them in a large container that is at least 18 inches deep and wide. You will need to provide a tall trellis or stake for them to climb. Container plants will need more frequent watering than those in the ground.
Why are my yardlong beans not flowering?
This is usually due to too much nitrogen in the soil or not enough sunlight. They need full sun to flower. Also, if the nights are too hot (above 75°F), they may drop their flowers. Be patient; they often start flowering when the weather stabilizes.
Are yardlong beans the same as green beans?
No, they are a different species. Green beans are Phaseolus vulgaris, while yardlong beans are Vigna unguiculata. They have different growth habits, flavors, and heat tolerances. They are related to black-eyed peas.
Can I eat the leaves of the yardlong bean plant?
Yes, the young, tender leaves are edible and can be cooked like spinach. They are quite nutritious. However, harvesting too many leaves will reduce pod production, so harvest them sparingly.
Final Tips For A Bountiful Harvest
To get the most out of your plants, you need to stay on top of harvesting. The more you pick, the more the plant produces. If you let pods mature and dry on the vine, the plant will stop producing new flowers. So, check your garden daily during the peak season.
These beans are also great for succession planting. You can plant a second batch in mid-summer for a fall harvest. In warmer climates, they will grow well into the autumn. They are a truly rewarding crop that brings a touch of the exotic to your dinner table. With a little care, you will have more beans than you know what to do with. They are a fun and productive addition to any warm-season garden.
Remmeber to save some seeds from your best plants for next year. Let a few pods dry completely on the vine, then shell them and store them in a cool, dry place. This way, you can grow this amazing vegetable for free every year. The taste of homegrown, fresh-picked yardlong beans is unmatched by anything you can buy in the store. They are crisp, sweet, and full of flavor. Start planning your trellis today, and you will be rewarded with a spectacular harvest all summer long.