There was a pretty good exange in hob about buying selling seed purity and a bit of strategic implications.
for a game that promotes hardcore, and intricate leveling ideas i've always felt given the time and complexity of purifying seeds it was so out of whack with how easy it is to transfer that work to someone just starting out.
I wish somehow crop purity was somehow tied into the actual field it is grown from. so here's my idea.
Tilled fields act as an elemental sink to some degree. Meaning if you were to freshly till a field and plant high purity seeds, the field would dilute the purity to some extent. As you raise your crops and purity not only do your crops gain purity but so would the field itself.
You could still rotate crops, but if you wanted to ensure high purity you would have to rotate crops of the same element adding yet more skill to farming.
selling high purity seeds would still hold value over virgin seeds however players using high purity seeds on freshly tilled fields would not get such a drastic boost.