depending on weather and depending on timing of divides, i will feed the pollen sub 4-6 weeks before any flow, and, once natural pollen is available in your area the bees will ignore it, but they do utilize it until then. it may be inferior apis, but so is sugar syrup, fondant, sugar, winter patties, etc... just things we beeks do to manage and tweak our bees for the reason/purpose we do and the goal we desire to achieve. another reason i use pollen subs is for the russian bees. i have read many reports over the years, that these bees will not take pollen sub, well they do, and really does help to kick start brood rearing earlier than they normally would, and sometimes combined with sugar syrup. for the most part, i find that these bees still have plenty of stores left come late february and march, but will add a small pail on anyway.