פירוש על עבודה זרה 14:11

Only the edible portions of vegetables must be tithed. According to Nahum the Mede, all three parts of the dill plant are edible and therefore, all three must be tithed.

Eliezer seems to agree with Nahum—so why do the rabbis oppose him. The answer is that R. Eliezer refers only to the garden variety of dill. Wild dill does not require tithing for all three parts.