A grotto is any type of natural or artificial cave that is used by humans. Many religious shrines are set into grottos.
What do flowers make! Flowers make pollen.
Flowers can be used for: a display: fresh or dried flower arrangements, air freshener or scent: pot pourri oil, especially scented oils. if edible, for: wine, cordials, salad
---- . cave ----
It may be, it could also be small.