Sunflowers are the source of sunflower seeds, which are also a source of commercial oil. Mushrooms are generally mixed with other foods, such as salads or omelettes, or used as pizza toppings. Hops are flowers that are used to make beer. Of course, honey, maple syrup and sugar are all sweeteners. Ginger root is a flavoring that is also valued for medicinal purposes.
Mustard seed is used primarily as a flavoring in the condiment mustard.
Though mustard has been grown for centuries, Americans are the largest consumers, with much of it used on hot dogs. A number of plants are grown as a source of oil, generally extracted from their seeds. Similar oils are obtained from better known crops, such as corn oil. Rapeseed has long been grown for its oil, which is still used as a lubricant and other industrial uses. It can also be used as a substitute for diesel or olive oil.