I’m so glad you’ll be seed bombing with your 3-year-old — I’ve got a lover-of-mix-and-messes over here, too, and it was a total hit! You can store your dried seed bombs for up to six months in a sealed container. I’d just be sure they’re fully dry before you store them. :)
What a LOVELY idea to gift them for the holidays! Enjoy!
xo,
e.