Echo Herbs

Echo Herbs, also known as Echo Grass, Echo Screen (山彦草, yamabiko-sō), and Echo Drops, is a recurring item in the Final Fantasy series. It can be obtained at a cheap price early in the games and cures the Silence status.

Final Fantasy
Echo Grass did not originally appear in this game until the Dawn of Souls remake.

Final Fantasy IV: The After Years
Echo Herbs can be bought in all stores, and acquired in various other ways.

Final Fantasy XI
Echo Drops can be bought from most merchants and found in treasure caskets throughout Vana'diel.

Final Fantasy Tactics
The ability required to use it can be learned from the Chemist Job for 120 JP.

Final Fantasy: The 4 Heroes of Light
Echo Herbs can be bought for 20 G at Guera, Arbor, Liberte, and Urbeth, as well as found in Liberte, Liberte's Whirlpool, Arbor, and Spelvia.