Taiwan Yard-long Long Bean is a heirloom pole variety that grows pods stretching 12 to 18 inches (sometimes over 3 feet) in a single growing season. Brought to America around 1970 by a Taiwanese immigrant, this rare Asian bean thrives in warm conditions between 75 and 95 degrees Fahrenheit, reaching harvest in just 75 to 80 days. The vines produce a heavy crop from minimal space, making them remarkably efficient for home gardeners seeking serious yields without sprawl.
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These beans deliver superior flavor to common varieties and shine in stir-fries, while the black dry beans that mature at season's end make a superb cooking bean. The sheer length of the pods, combined with their prolific set on vigorous vines, means you'll harvest armfuls from a small footprint. Plant them 18 inches apart on a trellis and watch them transform vertical space into an abundant, delicious crop.
These beans excel in stir-fries, where their length and tender pods can be cut into manageable pieces and quickly cooked over high heat. They're eaten fresh at the pod stage when young and succulent, but they also offer a second life as dry beans, which mature black and become a substantial cooking ingredient for soups, stews, and braises. Their versatility spans from quick weeknight vegetable side dishes to slow-cooked legume-based meals.
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Transplant hardened seedlings outdoors after the last spring frost when soil temperatures reach at least 70 degrees Fahrenheit, spacing plants 18 inches apart at the base of sturdy trellises or poles.
Direct sow seeds into warm soil after all frost danger has passed and soil has warmed, placing seeds at the base of a trellis or pole support.
Begin harvesting pods when they reach 12 to 18 inches in length, while still tender and before the seeds inside begin to swell noticeably. Pick regularly, every 2 to 3 days, to encourage continued flowering and pod production on the vines. Snap or cut the pods from the vine rather than pulling, which can damage climbing stems. If you want dry beans for cooking storage, allow some pods to mature fully on the vine late in the season until the pods turn pale and papery; the black seeds inside will rattle when dry.
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“This variety carries the immigrant's journey at its heart. Around 1970, a Taiwanese farmer brought seeds to America, carrying with them generations of Asian cultivation knowledge. The beans earned the affectionate nickname 'asparagus bean' among gardeners who recognized their delicate texture and flavor as something distinct from the common bean varieties already established in American gardens. What might have remained a family heirloom became a preserved curiosity in seed catalogs, a living bridge between two food cultures.”