Haul all the vines to the checkout, ask to speak to the owner ...
and point out that having clearly different vines all labelled
the same has just put his nursery on your do-not-buy list.

Then abandon the plants and go somewhere where they do label
them.

Tsu

Rather than abandoning the merchant altogether, I would simply bring the
problem to his/her attention. Very often, business owners are not aware of
the problems, or believe that their signage/labelling is sufficient. I
owned/operated a small business for 10 years, and always appreciated my
customers' feedback, both positive and negative, and would always act on the
negative feedback to improve my service level. A thunk a simple discussion
will bring much more positive results than simply dumping stuff on the
products on the counter, complaining, and then walking out.

--
Shadow
Made In Canada, eh.