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Glutinous Yam, Japanese Yam, Taiwanese Yam

Dioscoreajaponica

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Genus
Dioscorea (dy-oh-SKOR-ee-uh)
Info
Species
japonica (juh-PON-ih-kuh)
Info
Synonym
Sun Exposure
Sun to Partial Shade
Foliage
Smooth
Textured
Height
8-10 ft. (2.4-3 m)
Spacing
12-15 in. (30-38 cm)
Hardiness
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
Danger
Parts of plant are poisonous if ingested
Bloom Color
White/Near White
Inconspicuous/none
Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Other Details
Category
Edible Fruits and Nuts
Vines and Climbers
Water Requirements
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
Foliage Color

Unknown - Tell us

Where to Grow
Can be grown as an annual
Bloom Characteristics

Unknown - Tell us

Bloom Size

Unknown - Tell us

Other details
May be a noxious weed or invasive
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)
Patent Information

Unknown - Tell us

Propagation Methods
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From bulbils
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Properly cleaned, seed can be successfully stored
Regional

This plant is said to grow outdoors in the following regions:

Orange Springs, Florida

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Gardener's Notes:

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W
weisgerr
Bismarck, ND | March 2009 | positive

Toensmeier lists this as hardy to zone 4 in his book Perennial Vegetables.

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