Step 1 : Introduction to the question "What do chefs call the green, leafy parts of plants?"
...The flavors we crave are in the green, leafy parts of plants. Chefs refer to these flavorful parts as herbs. This differs from spices, which come from any part of the plant that is not a leaf. Most of the popular herbs used in cooking grow around the globe, from temperate to hot regions and from the tropics to the polar regions. Some plants, like dill, can be spices and herbs. The seeds of the dill plant are a spice while the leaves are an herb. Source: Encyclopedia.com