I think that even if I didn't use Cilantro as a culinary herb, I'd plant it in the garden just for the blooms. Lucky for me, the long-standing Cilantro that I let go to seed in my garden last year has come up in new places this year and a few plants are blooming again. This is beyond a win-win situation in the vegetable garden. I get pretty long-blooming flowers while attracting beneficials to the garden, and I may just never have to purchase Cilantro seed again. Or if I want, I can harvest that seed, and wallah, I have Coriander. I'm sold. The Cilantro (Coriandrum sativum) will forever be allowed to hang around my vegetable garden in all its stages.
The clover pictured below is also paying off handsomely. I planted it as a cover crop for its nitrogen-fixing qualities and to attract bees, but it's not half bad in bloom either.