Marigold (Calendula officinalis) is a traditional medicinal plant (e.g. wound healing) but can also be simply used for food coloring (e.g. for cheese and butter).

The pollen was photographed in a scanning electron microscope and the image was colored with artificial intelligence (AI & Deep Art).

If you want to know how big each pollen is:
simply measure them yourself in strucTEM-Measure by clicking on the image:

https://www.structem.eu/tools/measure/?lang=en&id=z202307-strucTEM-marigold-pollen