Cinaid ordered you to find dwarves, cut their beards from their chins and return them to him to feed to your sapling.
'Dwarf beards lack flesh that will feed, but the coarse hair can be used to twist and deform your sapling, making the creature suffer at the hands of the bearded creatures. They will come to know the smell of the enemy and associate their painful growth with dwarf-kind. Its animosity will grow and further its corrupt spirit. It will be poisoned against another of the Free Peoples... all due to your contributions.'
Cinaid directed you to collect dwarf-beards to use in creating a painful growth process for your sapling so that it will learn the scent of the dwarf and associate it with the pain of its adolescent growth.