First make sure u have opened any sticker packs in the sticker shop. U automatically have a couple if its your first time playing. If not buy the first pack to make sure you have enough consumable cards/potted plants. Then the easiest mode is garden ops, but this can be done in multiplayer gardens and graveyards. U need to first build a garden in one of the designated spots before the pots appear. "B" is the build button so just hold it to build garden. Once its built you will see pot's placed all over. Just go up to one and press B. Now pick anyone u want that u have. U have to have a card to plant. Once 5 are built achievo should pop. You will get Grow a friend achievo in the process of this. 1 session means has to be done before current game/win/lose is over.