The mustard greens have a rich flavor and are a widely accepted vegetable. Mustard greens makes a great substitute for spinach and chard because the leaves do not accumulate oxalic acid. Therefore they do not rob the body of minerals. Mustard seeds should be germinated at about 50 seeds per tub, and then thinned by harvesting to about 20 plants as they grow. Mustard or mustard greens is a cool weather plant that is generally grown for its tasty leaves by the home gardener.
Hot weather tends to make the plant bolt and go to seed.
The seed is what the commercial grower is after. This is what makes the condiment table mustard. Mustard can be harvested several ways.