Not the definitive source, but Wikipedia says "The umlauted ⟨ü⟩ is recognised but is only used in names of German origin, and in German loanwords such as müsli. It is otherwise treated as a variant of ⟨y⟩ and is called “German ⟨y⟩”.
Dandelions are much better for your soil…and for the environment. Their roots reach down taking water deep and enriching the earth. (Turf grass only goes down an inch or so.) Bees and other insects like dandelions; humans would die without insects. And yes, kids love dandelions…and so do adults who take notice.
Not the definitive source, but Wikipedia says "The umlauted ⟨ü⟩ is recognised but is only used in names of German origin, and in German loanwords such as müsli. It is otherwise treated as a variant of ⟨y⟩ and is called “German ⟨y⟩”.