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Types and sizes: Pot Leeks: Must have a blanched (white) area no longer than 150mm (6 inches) with no limit on the circumference. Intermediate Leeks: Must have a blanched area of 150-350-mm (6-14 inches), with no limit to their circumference. Blanch leeks or Trench Leeks: Must have a minimal blanched length of 230mm (9 inches) and can go up to 600mm (24 inches). The minimum length for blanch leeks is 350mm (14 inches http://woolshed1.blogspot.com/2009/11/leeks-their-growing-and-showing.html http://www.nvsuk.org.uk/medwyn-williams-vegetable-grow-show-25.html http://www.chroniclelive.co.uk/north-east-news/evening-chronicle-news/2011/09/05/winlaton-pals-leeks-win-turf-hotel-leek-show-72703-29365713/