Last florets in a Pteronia incana head may take their time, given growing conditions in the microcosm around a particular bush. This spreads the seed setting by lowering the risk of failure and also extending the catering service duration for the benefit of pollinators.
Too short blooming seasons may cause hardship among service providers, their survival key to next year’s pollination. This is the crux of mutualism in interspecies benefit and obligation arrangements.
The evolution that set it all up is a complex affair, like the insurance industry crafted by actuaries: Self-interest is enhanced to the collective level. Explicit or implicit caring for partners and associates has to happen for things to work out.
The selfishness of the gene in nature is similar to but not mathematically aligned to "kindness" given, as in the business world (Vlok and Schutte-Vlok, 2015; Manning, 2007; Manning and Goldblatt, 1997; iNaturalist).