The seeds that will reward Motes of Harmony are named “Songbell Seed”. They are found at Merchant Greenfield, the panda NPC.
You need to be revered with “The Tillers” faction in order to buy these seeds. So you will have 12 spots to plant the seeds, three parcels. 12 spots will reward 12 Motes of Harmony which means that every day you can get one “Spirit of Harmony.