General Plant Information (Edit)
Plant Habit: Vine
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Mesic
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 11
Plant Height: 9 feet
Plant Spread: 5 feet
Flowers: Fragrant
Flower Color: White
Other: The flowers are dioecious (individual flowers are either male or female, but only one sex is to be found on any one plant so both male and female plants must be grown if seed is required)The plant is not self-fertile.
Flower Time: Summer
Propagation: Seeds: Days to germinate: 1 to 3 weeks
Other info: Sow March to April in a sunny position in a warm greenhouse and only just cover.
Propagation: Other methods: Cuttings: Root
Other: Tubercles (baby tubers) are formed in the leaf axils. These are harvested in late summer and early autumn when about the size of a pea and coming away easily from the plant.

Image
Common names
  • Chinese Yam
  • Korean Sweet Potato
  • Cinnamon Vine
Botanical names
  • Accepted: Dioscorea polystachya
  • Synonym: Dioscorea batatas

Photo Gallery
Location: All pictures taken in/on my gardens/greenhouse/property
Date: 2019-10-26
tubercles

Date: 2021-09-26
Location: Fairfax, Virginia (May 2022)
Date: 2022-05-15

Beautiful yellow leaves in falll
Location: Fairfax, VA | September, 2023
Date: 2023-09-17
Location: All pictures taken in/on my gardens/greenhouse/property
Date: 2023-07-27
very fragrant
Photo by sedumzz

photo credit: H. Zell
Location: Annadale, VA
Date: Nov 28, 2011
Location: Annadale, VA
Date: Nov 28, 2011

Date: 2012-04-14
Location: Northeastern, Texas
Date: 2012-04-14
Young vines, emerge in spring when the temps are to its liking.
Location: Northeastern, Texas
Date: 2012-06-11
Pea sized tubers grow from the leaf axils are tasty edibles
Location: Northeastern, Texas
Date: 2012-06-11
Air-potatoes are edible pea sized tubers that grow from the leaf
Location: all photos from my garden
Date: 2015-06-08
'variegata'
Location: Allentown, Pennsylvania
Date: 2015-06-05
Glossy leaves are heart-shaped at ground level, turn pointier up
Comments:
  • Posted by valleylynn (Oregon City, OR - Zone 8b) on Nov 28, 2011 8:39 PM concerning plant:
    There are many cultivated forms with different root shapes in China and Japan[174]. The yam is a climbing plant that supports itself by twining around the branches of other plants[219]. It can be grown successfully into small bushes or, perhaps simpler when being grown as a root crop, it can be grown up a frame in a similar manner to growing runner beans

    The small white flowers have a pleasant scent of cinnamon

    The flowers are dioecious (individual flowers are either male or female, but only one sex is to be found on any one plant so both male and female plants must be grown if seed is required)The plant is not self-fertile.


    The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil.The plant prefers acid, neutral and basic (alkaline) soils..It can grow in semi-shade (light woodland) or no shade.It requires moist soil.

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