By Roseslater
Hertfordshire,
United Kingdom 
pak choi how to prevent bolting
26 May, 2010
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First, I would mulch the soil surface, Roseslater, to even out soil temperatures. I would also use moderate amounts of high nitrogen, low phosphate fertilizer--too much phosphate hastens bolting, as does too little nitrogen. Once bolting starts, nothing stops it.
31 May, 2010