How prolific is dill?

In real life Charles Baker Harris (dill) represents Truman Capote who was Harper Lee's best friend

They do. If they don't have dill in the brining liquid they are just plain "pickles".

You can substitute 1 tablespoon dill seed for 3 dill heads. The flavor will be less pungent than if you use fresh dill.

Yes, but the taste and texture will be different. For example, you may substitute celery for celery seed, but don't expect the same result.

i have a recipe that requires 1 head of dill but i only have dill weed. can i substitute with the same results and what is the equivalent?