As September unfolds, the urge to tidy up the garden and deadhead spent blooms can be strong. However, for those who wish to support migrating hummingbirds, leaving certain tubular flowers untouched is a crucial act of kindness. These plants, including salvias, agastaches, penstemons, bee balm, cigar flower, and cardinal species, offer a vital late-season nectar source that fuels the tiny birds on their long southward journey.