celery lettuce, asparagus lettuce, stem lettuce, Wo Ju, Woo Chu, Wo Sun, Stemuretasu, Kaki-Jisha.
Celtuce is native to China. It is mostly grown in South
China. It is a cool season crop. Seeds germinate poorly when
temperature is high. Usually, optimum germination temperature is
15-20℃. Except special summer
cultivars, most celtuces are sensitive to bolting in hot summer.
Shortage of water and fertilizer as well as big day-night
temperature difference may contribute to premature bolting.
Recommended planting density: 20-30cm between plants
in a row. For commercial production, transplanting is recommended.
The stem is used for vegetable in China. however, the
leaves can be used as lettuce for salads.