At least I never knowingly bought them. The heavy duty broad leaf ones have been doing well in my planter for quite awhile and I even transplanted a few to pots. Suddenly a few weeks ago I saw two new branches pop up with the yet unborn leaves rolled into a ball ready to be unfurled. Much to my surprise it's a different type of fern with much more delicate leaves. The broad leaf ferns don't send out new branches like that, at least that I've noticed. I do remember large ferns on the Olympic Peninsula using that frond unfurling method.
Almost everything I bought at nursery's (vivero's) came with another plant or two, sometimes knowingly and others snuck in the back door. The orange/pink plant below I have no idea where it came from or what it is but it produces a lot of seeds and spreads. Another is Noche Buena or Poinsettia. This Noche Buena does not get totally red leaves, just a little red in he middle. It keeps popping up all over the yard well after I've pulled up all the old and tired ones
Young delicate frond popping up
With 12,000 species I don't expect know which is which
Broad leaves in planter with unknown
Two unknowns but I'm assuming the lower is a weed
From Facebook the orange identified as Crossandra