Lathyrus davidii
Family: Fabaceae or Leguminosae
What it is like
Lathyrus davidii is a PERENNIAL growing to 1.2 m (4ft). See above for USDA hardiness. It is hardy to UK zone 6. It is in flower from July to August, and the seeds ripen from August to September. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. It can fix Nitrogen. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.
Height (m): 1.2
Where it is found
Woods and thickets all over Japan. Hill slopes, forest sides and bush-woods, usually at altitudes lower than 1800 metres in northern China.
E. Asia - northern China, Japan, Korea, Manchuria, Russia.
Conservation Status:
Countries/locations it is found in
How it is used
Food
Rating: 1
Seed - cooked. Some caution is advised, see the notes above on toxicity. Young seedpod - cooked. Young plant, including the inflorescence - cooked and used as a potherb or added to soups etc.
Seed: includes nuts, cereals, peas and beans.
Seedpod: things such as Okra, French and Runner beans.
Medicine
Rating: 0
Other
Rating:
Nitrogen Fixer: Plants that fix nitrogen in the soil
How it is grown
An easily grown plant, succeeding in any moderately good garden soil but preferring a position in full sun. This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby.
Propagating it: Pre-soak the seed for 24 hours in warm water and then sow in early spring in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer. If you have sufficient seed, then it can also be sown in situ in mid spring. Division in spring. It may not transplant well so care should be taken.
Best place to grow: Woodland Garden Sunny Edge; Dappled Shade;
Habit: Perennial
Hardiness: 5-9
Growth:
Soil: Light (sandy), medium, heavy (clay)
Shade: Semi-shade, no shade
Moisture: Moist
Things to keep in mind
Although no records of toxicity have been found for this plant, the seed of some species in this genus contain a toxic amino acid that can cause a severe disease of the nervous system known as 'lathyrism' if they are eaten in large amounts (although small quantities are said to be nutritious). Great caution is advised.