Geese may eat wheat and pellets, which is a common diet for farm-raised geese. Geese will mainly eat grass as the most part of their diet But they should be given some amount of … YUCK!!!!! You should have already raked the seed lightly into the soil surface, covering it to a depth of 1/16 to 1/8 inch. Geese are grazing birds that eat a variety of different items. Simply covering up the grass seeds often prevents birds from eating them. This is especially true of fresh Spring grass, which contains all the vitamins and minerals geese need for a nutritious diet. Geese may eat bread, but they do not derive much nutrition from it. They also eat insects and Canada Geese can submerge their heads in water to graze on aquatic plants. The grass should be kept no higher than three inches. Geese eat grass by grabbing the blade with their bill then tearing it from the ground. geese do NOT eat algae for god's sake algae is POISONOUS!! to fowl!! They also eat insects, fish, rice and corn. They eat roots, shoots, stems, seeds, and leaves of grass and grain, bulbs, and berries. Surprisingly, geese can do quite well on a diet of nothing but grass provided it’s sufficient in both quantity and quality. In some areas, there are laws against humans feeding geese. Avoid fertilizing the lawn during mid-summer when geese land, since they prefer short, damp lawns that have been fertilized, because the fertilizer adds nutrients to the grass they eat.