My day Lillie\'s get hard ball type green things after the flowers bloom they are not buds they eventually turn black like they are rotting they are full of them they\'re on a long stem like the flowers
These are seed heads. You want to remove them. Cut the stem down to the base of the plant. When you new flowers become spent remove them. When the cluster of flowers is finished cut the stem off at the base. This will help encourage the plant to form new stems and flowers. By leaving the seed heads on the plant spends energy on developing mature seeds instead of reblooming.