Reference article
Seeds (Duck Life 9: The Flock)
Basic Seed, Super Seed and Ultra Seed are food types; crop seeds instead grow ingredients on farming patches.
Food seeds
The food definitions give Basic Seed 20% hunger and 1 Energy XP, Super Seed 30% and 20 XP, and Ultra Seed 40% and 20 XP. Ultra Seed additionally awards XP to the six racing skills. Their acquisition routes differ; the current Food Shop’s starting menu contains Basic Seed.
Crop seeds
Plant crop seeds through the flock’s farming facilities. They grow Duckroot, Seedspice, Beakblossom, Juicespruce or Dazeradish rather than directly feeding a duck.
Across the games
Compare games and editions on the 
Seed page.