Herbs and spices sit beside each other in the cabinet, get mixed into the same recipes, and often appear together in the phrase “herbs and spices.” That makes it easy to assume the names describe the same kind of seasoning. They don’t. In culinary terms, the difference comes down to which part of the plant you’re using. Leaves are herbs, while seeds, bark, roots, fruits, flowers, and other plant parts fall into the much broader spice category.
That simple rule explains why rosemary is an herb, cinnamon is a spice, and one plant can sometimes give you both.
Herbs come from the leaves
In cooking, herbs are the leaves of plants used to add flavor.
Parsley is an easy example. The leaves and tender stems are used fresh or dried to season food, putting it in the herb category.
Rosemary and bay leaves reveal why the culinary definition matters.
Rosemary grows on a woody shrub, while bay leaves come from the bay laurel tree. Botanically, those plants don’t fit a narrow definition of herbaceous plants, but their leaves are still considered herbs in the kitchen.
The plant doesn’t have to be small, green, or tender. It’s the part you’re using that matters.
Spices can come from almost everywhere else
Spices cover a much wider range of plant parts.
Cumin comes from seeds. Cinnamon comes from dried inner bark. Ginger comes from an underground rhizome.
Black pepper provides a less obvious example. Those little peppercorns may resemble seeds, but they’re dried fruits produced by a climbing vine.
Then there’s saffron.
The thin red strands used as saffron are stigmas from crocus flowers. Each flower produces only a few, helping explain why harvesting enough saffron takes so much work.
Seeds, bark, roots, rhizomes, fruits, and flower parts can all end up in the spice cabinet.
One plant can give you an herb and a spice
Cilantro and coriander make the distinction easier to see.
In American usage, cilantro refers to the plant’s leaves and stems. Because you’re eating the leafy portion as a seasoning, cilantro is an herb.
Coriander seeds come from the same plant, but seeds fall into the spice category.
Same plant, different part, different classification.
Names vary by region, which can make this example confusing. In some countries, coriander is also the name used for the leaves.
Fennel does the same thing
Fennel provides another example without changing plants.
Its tender green fronds can be used as an herb, including with fish and other dishes.
Fennel seeds are a spice. Their anise-like flavor appears in foods such as Italian sausage.
Again, the difference isn’t the plant. It’s which part of that plant reaches the recipe.
Fresh versus dried doesn’t decide it
It can be tempting to think of fresh green seasonings as herbs and dried powders as spices, but that rule falls apart fast.
Dried rosemary remains an herb because it comes from leaves. Ground cinnamon remains a spice because it comes from bark.
Drying or grinding changes the form of the seasoning, not which part of the plant produced it.
Herbs and spices can end up in the same jar rack and even come from the same plant, but the distinction is simpler than it looks. If you’re seasoning with the leaves, you’re using an herb. If the flavor comes from the seed, bark, root, fruit, flower, or another part, you’re in spice territory.
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