Glutinous Yam, Japanese Yam, Taiwanese Yam
Dioscorea japonica

Family: Dioscoreaceae
Genus: Dioscorea (dy-oh-SKOR-ee-uh) (Info)
Species: japonica (juh-PON-ih-kuh) (Info)

Category:

Edible Fruits and Nuts

Vines and Climbers

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)

Sun Exposure:

Sun to Partial Shade

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

Foliage:

Smooth-Textured

Shiny/Glossy-Textured

Other details:

May be a noxious weed or invasive

Average Water Needs; Water regularly; do not overwater

Requires consistently moist soil; do not let dry out between waterings

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Suitable for growing in containers

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

Seed Collecting:

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

Orange Springs, Florida

Gardeners' Notes:

1
positive
0
neutrals
0
negatives
RatingContent
Positive

On Mar 13, 2009, weisgerr from Bismarck, ND wrote:

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