This swap is shaping up to be a bit different, and I think that's just fine. That makes it interesting.
Curious about this aspect: if trader A lists 3 packs of Penstemon digitalis and 4 players request those seeds, how will it be determined which traders get the packets if all other factors are equal? Divide the packs further? First come, first served? Draw straws?
Or, have participants put their list of requested seeds in order of preference and devise a metric to mete them out that way?