If you must substitute, see below:
Dill seed is not a good substitute for fresh dill weed because of the difference in flavor strength but it does depend on the recipe. The seed has a camphorous, slightly bitter flavor, and the weed has a delicate flavor. The differences are like night and day.
Do you know how much dill seed is equivalent to one head of fresh dill?? I am going to make pickles, and fresh dill is not available. Thanks in advance for your help. – Judith Cartwright (8/22/01)
3 heads dill = 1 tablespoon dill seed
1/2 ounce dill seed = 1/2 cup fresh dill
3- to 5-inch sprig of fresh dill = 1/4 teaspoon of dried dill weed.
Dill seeds are widely used in pickles and bread baking. They are also added to soups or such long-cooking dishes as stews to add an extra layer of flavor.
If you think of a delicate herb that is still capable of freshening up a dish, dill will be one of the first options to come to your mind. While the flavor of both dill weed and seed is unique, there are other great options in case you need to substitute them.
Like tarragon and anise, chervil also has notes of licorice. Having a taste similar to parsley and being widely used in French cuisine, chervil is often referred to French parsley.
2. Fennel Seeds
Substituting dill seeds with other seeds is easy as you don’t have to make complicated measurements.
You can use coriander seeds both whole and ground. Ground seeds are better when you are trying to evenly distribute the seeds in doughs.
Fennel comes from the same herb family as dill and it is not surprising that it is a good substitute for dill.
The flavor profile of fennel can be described as light and sweet . Just like dill, it brings a lot of freshness to the dish. It also has a very faint licorice aroma.