I have them in the plot and garden year round Aqui. These ones, I think, went in late summer time, similar time to my leeks. I am not bothered about the whiteness, even with my leeks, and we do get through a fair few! They can be very quick, and you could start some now in pots or modules, a pinch of seed in each module and plant out where ever you have space, then when you want a few, you pull out a bunch!