Dill vs Dill seed
The short answer
The same plant again, and again two ingredients rather than one. Dill weed is the feathery leaf, sweet and grassy, and it collapses in heat — a pickle seasoned with it is bland within a month. Dill seed is the ripened fruit, closer to caraway than to the leaf, and it survives brine and boiling indefinitely. A teaspoon of seed weighs 2.1 g and a teaspoon of dried weed 1.0 g, so measuring one for the other by volume is wrong twice over.
Side by side
| Dill | Dill seed | |
|---|---|---|
| Botanical identity | Anethum graveolens L. | Anethum graveolens L., Anethum sowa Roxb. ex Fleming |
| Part used | leaf | seed, leaf |
| Origin | The eastern Mediterranean and western Asia. | The eastern Mediterranean and western Asia, with cultivation attested in Egyptian and Mesopotamian records and a long documented presence across Europe and South Asia. |
| Flavour notes | grassy, cooling, faintly aniseed, citric, clean | sharp, warm, faintly bitter, citric |
| Heat | Scoville does not apply | Not established |
| Flavour | Light, green and cooling, with a faint sweetness and none of the sharp warmth of the seed. Dill leaf is a finishing herb: it has very little that survives cooking and a great deal that arrives immediately. | Warm, sharp and slightly bitter, with the anise-adjacent character carvone gives and a lighter, more citric finish than caraway. It is assertive for a seed of its size and easy to overdo — a teaspoon carries a whole loaf. |
| Aroma | Grassy, faintly citric and slightly aniseed, with a clean cool quality that is distinctive and hard to describe by comparison to anything else. It is considerably gentler than dill seed. | Sharp, warm and unmistakably caraway-like, with a thin citric brightness behind it and a faint bitterness. It smells very little like the dill herb, which is the fact that surprises people. |
Which should you buy?
Dill
Buy fresh dill and freeze what you cannot use. This is one of the few herbs where a home freezer genuinely outperforms drying: chopped fronds frozen in a little oil or water keep the cooling note that conventional drying destroys. Keep a small jar of freeze-dried dill for dips and dressings, and do not expect it to do the work of the fresh herb on cured fish or new potatoes.
Dill seed
Buy whole and grind only if a specific recipe demands it, which few do. Whole dill seed keeps for two or three years, releases its flavour readily into a brine or a dough, and stays visible where that is wanted; ground dill seed is flat within a month or two and cannot do the pickling job at all, since a brine wants seeds that release slowly rather than a powder that clouds it. This is one of the clearer whole-versus-ground cases in the dataset and also one of the least contested, because almost every traditional use of the spice keeps it whole.
Full detail on dill and dill seed, including evidence grades and sources for every claim above.