I've said this before, but the staff of flowers (XGtE, p. 139) is a surprisingly useful item for its level.
Does the staff of flowers require me to know a flower, or just know of a flower, to cause that flower to sprout?
Specifically, I want to know exactly how much knowledge of a flower is reasonable to grow it. Does one need to know the name? How it looks? Where it grows? How it can be used? All of the above?
Does one even need to know that something is a flower to make it grow? If a character has never seen Sugar Cane and hears the name, and they want to know if it's a flower or not, can they grow it? What if they know everything else about the plant except that it's a flower, and they want to confirm that it is one?