Everything Under the Moon

Typically I buy herbs when I have a pending need for them. The other day, I was unpacking and found two herbal packs I had gotten about 6 years ago. I don't remember what was in them but they are both still very aromatic, so I'm wondering if they were still viable for spell work. Wondering that got me wondering how long herbs would last if bought and stored away and how best to store them.

Eh.....I go by the rule that after 6 months the herb should be burnt as an offering instead of craft work