hi Sheri,
call your post office and ask.
as for shipping tips. I've gotten a few live
plants in the amil and they came several different ways, but the best looking ones seem to be the ones where people wrap the roots in a damp paper towel and then sandwich baggie over that.
try not to mail on an up coming holiday because your
plants will be in the post office over the holiday. And try and make sure who you are sending it to will be there to get it, it's not good for
plants to sit in a hot mail box (of course right now it wouldn't be hot, but could be too cold for it)
A box is nice if you can find one the right size, but then a bubble mailer works just as well.
other than that, just ship and hope for the best.