right or wrong, I bought a bunch of prepackaged flower seeds, popped them in a ziploc bag and brought them home in my checked luggage.
They were still in my bag when I reached home.
You can buy seeds at Prossers, Ace/Hofius and even at Caye Supplies so I imagine that the issue is most likely whether or not they are prepackaged or loose seeds that you picked yourself.
Come to think of it Cal had some prepackaged seeds mailed to him the other day that came via the post office and clearly marked seeds.
Go for it Harriette.