I have a little problem - somebody is eating my Echinacea's seed that I sow outdoors. As recommended, they are just placed on the ground, they germinate way easier if they have light. Their length is 2-3mm, fairly large seeds that I gather are too heavy for ants. I guess it might be birds that are having a healthy meal of Echinacea's seeds.
Does it make any sense to protect each seed by covering it with an upside-down positioned transparent plastic cup (used for human parties, etc.)? If yes, should I poke a hole for ventilation, so that I don't cook the seeds?
Some similar ideas can be found here, but this is for indoor seed starting.