Seeds are meant to survive digestive systems of the animals that disperse them. Are there seeds meant for a creature, who will digest most of the seeds for nutrition and disperse only a minority of intact seeds?
There's a very interesting case of mutualism between the species Homo sapiens and Oryza Sativa (also Triticum aestivum...). The humans have bred the plants to produce highly nutritious seeds, much greater then non-adapted species, and in return the humans save a small fraction of the seeds and will cultivate the plant for many generations.
It goes further then that in that humans also will protect their mutualistic plant partners from other invasive species and cultivate them, ensuring their mutual survival.