Use Seeds on your protagonist (or save them for later)

Speaking of treasure, you’ll find yourself armed with a healthy number of Seeds on your journey. Each Seed can raise the stats of whichever character you use them on, so you may feel tempted to just turn off your brain and dump them all on your main character. To that, I say… yeah, not a bad idea.
Sure, your protagonist is an all-rounder who can take advantage of every stat, so they have that going for them. But more importantly, your other party members will change their classes at least once during your (dragon) quest, which will revert their level back to 1 while retaining half of their previous stats. So if you raise a party member’s HP by 4 using seeds and change their class again, well… that’s kind of like you only raised it by 1. You don’t actually need to use Seeds to complete the main story, so you may prefer to hold onto them to help min-max your party if you decide to take on some of the game’s harder challenges down the line. But otherwise, the protagonist will generally get the most value out of each seed since they aren’t capable of class changing.