Because Ecke is responsible for well over 60% of the poinsettas sold, there is a good chance that you are buying one of there's.
If you can confirm that the poinsetta you are buying never, ever came from Ecke's Greenhouse. Then go for it.
Since most people won't take the time to ask. And most employees/store managers, when asked, won't know the answer.
It's best to skip Poinsettas all together this year.
A good rule in general is not to buy flowers you can't spell. ;)