Once dill flowers, leaf growth slows as the plant puts energy toward producing seeds. Dill leaves do taste best right when the plants are starting to flower, but once the flowers mature, the plants will start dying back. When dill produces a flower, harvest the plant.Click to see full answer. Similarly one may ask, can you use dill that has flowered?Dill is a biennial that is most commonly grown as an annual. Its leaves and seeds are culinary flavorings but flowering will impede leaves while providing the zesty seeds. Flowering in dill plants can be prevented if you wish to preserve the dainty foliage for seasoning.Also Know, does Dill come back every year? Dill is a biennial warm-season herb, very sensitive to light-freezes and frost. Dill is not technically a perennial plant, because a single plant only lives 2 years. It is quite proficient at self seeding (if allowed). If let grow naturally, A single dill plant should come back year after year. Secondly, what do you do with dill after flowering? Cut the flowers from the stem and add to a soup, stew or the bottom of pickle jars. For dips and sauces, chop the flowers before adding them. Dill flowers can be used in place of sprigs of fresh dill weed in recipes; use one to two flowers for each sprig.Why does my dill plant die?Yellowing is a normal process when cold temperatures enter the picture and the plant begins to die back. Cold weather will signal that the growing season is over, and once the seed is set, the plant has done its work and will die. Yellowing dill plants are also commonly caused by incorrect cultural care.