Gatherer's Gardens function in Minerva's Den the same way as the ones in BioShock 2. However, some of the offered Plasmids and tonics have changed. Different Plasmids and Gene Tonics become available at different points of the DLC. If the player does not buy or pickup certain Plasmids/Tonics or upgrades on the level they first appear, then they will become available for purchase in future levels, although this doesn't apply to all Plasmids and Tonics.