96 karma · joined July 15, 2022
Some flowers can only be pollinated by insects of particular sizes or shapes because of the position of the pollen-producing (anthers) and pollen-accepting (stigma) structures, and some insects bypass pollen entirely by biting a hole in the base of a flower to drink the nectar, and some insects don't visit multiple flowers of the same species consistently enough to transfer pollen (honeybees for instance apparently) as efficiently as other insects (bumblebees).
Most wasps (of which hornets are a subtype) are only interested in nectar, not pollen, and some flowers don't produce nectar so won't be visited by wasps. Most wasps have short tongues for their body size, so they can't access some flowers that bumblebees can (bumblebees have long tongues). Some bees (bumblebees or mining bees for instance, not honeybees) buzz their wings to extract pollen from particular flowers like blueberries and tomatoes, enabling them to be pollinated effectively, and wasps don't do that.
So giant hornets can't do all pollinating that bees can do. However, in the upper Midwest the spotted bee balm (Monarda punctata) is pollinated by large wasps, so there might be other flowers in the area invaded by giant hornets that could be pollinated by them.
Disclaimer: I'm an amateur, not a scientist with a degree.
It's cool that the Sun Clock has the moon phases and that the sun (according to another comment) goes the correct way in the Southern Hemisphere. I kind of wanted to add the moon but hadn't thought about the position of the sun.