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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.
 
The outdoor farm is a great way to use seeds that you don't need. It also doesn't need workers, so you can run more workshops that are staffed by those botanists you don't need anymore.