10 Red Mangrove Propagules (Seedpods)

I would like to use some in fresh and some in salt. Will that work

Have you grown up in fresh or salty water? Because after putting them in the salt water began to wither somewhat!

Would these pods survive two weeks in the mail?

Can these be full submerged in the tank? i have a 60 gallon that i would like to plant them in. the aquarium is already heavy planted and has a co2.