Throw them down a certain pit :-D
But yeah, seeds weirdly go from limited to endless in a very short window of time. At 20 temp 10 water they are precious (pro tip: hydro farms actually have the same seed output as regular farms, 1/sol), at 30 temp 15 water they are abundant (cover crops), at 30 temp 15 water they are trivialized (bushes).
Maybe make a game out of sending as many seed missions out as fast as you can? Although a medium patch of bushes is probably still enough for that.