pak choi

50 days.

brassica rapa
Also known as bok choi or pok choi, 15-18" tall heads of mild-flavored stalks and leaves, well known in Asian cuisine.  Great in stir fry or pickled, biennial grown as an annual.

Direct seed 1/4" deep and 1/2" apart into well-prepared soil right about the time of the last frost, or start indoors 4-6 weeks earlier.  Thin direct-planted seedlings or transplant indoor plants 6-12" apart in rows 18-36" apart.  For a fall crop, direct seed by August. Keep soil evenly moist during growing season.  Shading plants during the hottest part of the growing season extends your harvest time.