Gaga-imo, scientifically known as Metaplexis japonica, is a vigorous twining vine native to East Asia that produces edible tubers on rhizomatous perennial roots. This deciduous herbaceous vine grows rapidly on annual stems that can reach 25 feet high, spreading across trellises or climbing structures in zones 6 through 8. With showy flowers blooming June through August and ornamental fruit to follow, it combines ornamental appeal with practical yield, thriving in full sun to partial shade and tolerating drought once established. The plant's hardiness extends surprisingly far north, plants have naturalized near Ames, Iowa, suggesting resilience beyond typical zone 6b expectations.
Partial Sun
Moderate
6-8
300in H x 72in W
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High
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Gaga-imo's rhizomatous root system makes it a perennial in colder climates, returning year after year even when annual stems die back in winter. The vine's combination of showy summer blooms and conspicuous fruit creates visual interest across the growing season, while the edible tubers provide genuine harvest value. Its tolerance for drought and ability to thrive in average, well-drained soils means once you plant it, this vine asks little of you while delivering substantial returns.
Gaga-imo is primarily grown for its edible rhizomatous tubers, which are the plant's main harvest. The vine's vigorous growth habit and showy flowers and fruits make it equally valuable as an ornamental plant on trellises or climbing structures, blending food production with landscape interest.
No timeline data available yet for this variety.
Harvest tubers in fall after the vine's annual stems have died back, typically in October or November depending on your zone. Dig carefully around the base of the plant to extract the rhizomatous tubers, being mindful of the perennial root system you want to preserve for next season's growth.
As a deciduous twining vine with annual stems and perennial rhizomatous roots, Gaga-imo naturally dies back after frost and returns from its roots each spring. Prune dead stems in early spring to direct new growth along your trellis system and remove any weak or wayward growth as the vine establishes.
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“Native to thickets, forest margins, grasslands, and streambanks across China, Manchuria, Japan, and Korea, Metaplexis japonica has a long history of cultivation throughout East Asia for its underground tubers. The plant's presence in North American agriculture became notable in the 20th century when plants were discovered spreading through cornfields near Ames, Iowa in 1958, suggesting it had been introduced and cultivated there earlier. This unexpected naturalization in USDA Zone 5 territory demonstrated the vine's hardiness and adaptability far beyond its native range, eventually leading to its inclusion in temperate zone gardens.”