Phlox, coneflowers, Russian sage, butterfly bushes, liatris, and
grasses are companion plants for daylilies.
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It is not listed for doing so in the link below.
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Celery is a good companion plant for bush beans and cucumbers.
Daisies, snapdragons, leeks, tomatos, cauliflower, and bush beans
are all good companions for celery. So, bush beans being on both
lists might be the ideal companion plant.