Step-by-Step Growing Guide
Tatsoi (Brassica rapa var. narinosa) is a flat-growing, cold-hardier-than-most Asian green forming attractive dark green rosettes at ground level. It prefers well-draining, moderately fertile soil with a pH of 6.0–7.0. Direct sow from late summer through autumn (or early spring) at 0.5 cm depth in rows 30 cm apart, thinning to 20–25 cm for full rosettes. For baby leaf production, broadcast thickly and harvest with scissors at 5–7 cm. Water evenly and consistently — drought stress triggers bolting. Apply a nitrogen-rich fertiliser every 2–3 weeks for the fastest growth. Tatsoi is genuinely cold-hardy, surviving temperatures down to –10°C under snow, which actually enhances its flavour by converting starches to sugars. In summer, it bolts quickly above 25°C; grow in light shade or restrict to autumn/spring/winter cycles. Growth slows dramatically in cold but never stops entirely.