Wow, that is annoying. The instructions should tell you how to plant where, when and also say how long they take to show.
Over the years I am fed up telling people to complain when they have complied with these instructions and nothing has appeared.
(not just what you have grown, loads of things)
People seem to be scared too complain. Think that they have 'done something wrong'. So, it must be their fault.
Recently, I got two people to actually make a complaint and guess what, they either got replacements or a credit.
Keep complaining to these companies if what you buy is not thriving when you grow according to their instructions....
PLEASE