I found it really hard to find information of any substance or at all in any books on this plant.
But, if ever you wished to go green really quickly this is the plant for you. I chose white mustard. Instructions say it can be grown on tissue paper! it is that easy. I planted the seeds a different way [no particular reason, partly why there are so many books on gardening I suppose…] then planted outside.
Some say crop the plant just before flowering, the instructions say when its 2″ tall? I say whatever makes you happy. Why? Because, again, the varying schools of thought suggest that the taller the plant the stronger the taste…
Now it is all cropped? Chop it. Eat it. Next time I can grow it to my own specific taste. My tip. Sow a little [about ten seeds] every two weeks and keep the crop turning over.