White Stem
Brassicaceae
Bok Choy
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AI-generated botanical watercolor illustration of Bok Choy.
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Bok choy (Brassica rapa subsp. chinensis) has been cultivated in China since at least the 5th century. It spread throughout Asia and was brought to the West in the 19th century. "Bok choy" means "white vegetable" in Cantonese.
Bok choy is surprisingly well-suited to the PNW when grown in the cool seasons. Our spring and fall provide ideal conditions. White Stem is a classic variety. For a stunning garden plant, try Purple Choi or the miniature varieties (Toy Choy, Shanghai). Sow early March under row cover for May harvest; sow late August for October harvest.
Direct sow in early spring (March-April) or late summer (August-September). Sow 1/4-1/2" deep, 4 seeds per sq ft. Thin to 6-8" apart. Bok choy is fast — 30 days for baby, 45 days for full size. Keep moist; drought stress causes bolting. Harvest whole heads at soil level when they reach desired size, or harvest outer leaves. Spring plantings must be harvested by late May before bolting. Fall plantings produce the best quality — cooler weather yields sweeter, more tender bok choy.