What is the Singular possessive of -fern-.... and WHY?

The singular possessive of most words is

's

fern's fronds
friend's house
boy's room

Yes, the plural of fern is ferns.

Most plural nouns add the apostrophe after the s.

Singular: fern
Plural: ferns
Singular possessive: fern's
Plural possessive: ferns'

I have one fern in a pot. The fern's pot is too small.

I have several ferns growing in my yard. The ferns' fronds have started to wilt.

So if it's PLURAL, then it's FERNS. If it's PlURAL POSSESSIVE, then is it stil the same with the singular but in a different way?

U all r wrong ferns singular possessive form is add a ‘s and plural is ferns and plural possessive is ferns’

What is the singular possessive of FERN.. and WHY?

Ok. So for plural possessive you put the comma after the S. Why is that?

Ok, sorry Ms.Sue, i didn't read you're sentence completely. Thanks Ms.Sue! :)

You're welcome, Losa.

singular possessive of fox, plural of fox

Also sorry about my texting just trying to get my point across