Does mold only grow upwards?

[Guest guest]

I've been told that mold only grows up-it starts on the ground and grows up to

the end of the sheetrock-it can't grow past the spackle (or whatever it is they

use to cement two pieces of sheetrock together).

Is this true? Because I'm looking at the bottom of the sheetrock in my kitchen

and I don;t see anything but I know something is there-do different molds grow

differently?

I know this is such a stupid question and I should know this by this time but I

don't.

Thanks for your help, Surella