Mustard and squash are not the same. Mustard: is a cruciferous, brassica annual herb, young stems and leaves with prickly hairs, spicy flavor, generally salted leaves for food, seeds and whole grass for medicinal purposes. Squash: is the main variant of mustard, is a semi-dry non-fermentable pickles, to the stem with mustard as raw material pickled, is one of China's famous specialties and the French cucumber, German sweet and sour kale and known as the world's three famous pickles.