Your first Beastmoon hunt will give you two planters to plant these seeds in. You get a third at 25 games. It isn't very much, but on the bright side these seeds are extremely fast.
You should have received two Beastmoon Planters when you finished your first match on the Beastmoon Hunt. If they aren't in your backpack, check your Bank.
Doe's anyone know where I can find a beastmoon seed planter at? Thanks, nightwolf
You get the first two automatically after you complete your first Beastmoon match. You get a third after completing several more matches. I believe these are the only ways to acquire the planters right now.
Use hasty harvest tc to immediately make the beastmoon plants elder once they become mature, its more worth doing this with the school beastmoon plants, cause the regular ones only takes 45 mins to get to elder