Can you eat dried rose buds used for potpourri? I want to make some Rose Lemon Tea!!?

Like my question, Can you eat dried rose buds used for potpourri?
I want to make some tea, but not sure if these potpourri I see in retail stores (eg Wal-Mart) have any poison or chemical bad for human on it.

If not able to eat the retail store potpourri, where can I buy natural rose buds? I live in an apartment and I cannot grow them. :(

Of course, I will not be eating used potpourri, cuz scented oil are added to it. :)

Thanks!!

PS the tea I want to make is on this page. everything in Chinese though. If anyone'd like me to translate the recipe to you, I will. Just let me know. :)

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