The HACCP training I went through said that "like products" can be grouped together in the Product Description. Quoting directly from my personal notes, "Like products have similar characteristics as finished products (ex: different flavored cheesecakes that come in various sizes can all be in one plan)." As in, the finished products are similar. Going with the example I had in my notes, chocolate cheesecake would have a different PD than chocolate cake, because they're different as finished products (different composition, storage temperature requirements, allergen warnings, packaging etc. Not to mention the different process steps, as well).
If the tea varies greatly in characteristics other than flavor and also have different process steps, I think there should be separate Product Descriptions.
-Christina