Answer: It's difficult to coax cilantro to grow tasty leaves once it flowers. Your best bet is to go with gardener number three: start new plants.
Cilantro is an annual herb, a member of the parsley family. The seed is generally sown in cool spring temperatures for a summer crop, or as summer wanes for a fall crop. For good quality cilantro, harvest foliage prior to the formation of flowers. When the plant sets blossoms, foliage quality declines. Since yours has bloomed, you can leave the flowers on until the plant dies and then harvest the seeds (the seeds are the spice called coriander!). Grind the seeds to use in the kitchen, or save some to plant in August for a fall crop of cilantro.
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