The question here is: aren't those units already strong enough? Do they really need those seeds, does it noticeably make them better? Or...
...what happens if you feed all that stuff (chipped stars to raise the level cap in particular; but also all the seeds) to Jericho? Would she become good at some point? And what about her skills? Are some of those useful at least at one point in the game, or something?
And if not Jericho, the question still stands: wouldn't units like Kanami profit way more from STR seeds, than units that are already incredibly strong and gain lots of STR with each level up anyways?

She sucks almost no matter what, because her growth and bases are bad, gaining only +1 stats per lvl up when for example Rance gets +4 Str every lvl up or Kanami who gets +3.

This is lvl 40 vs lvl 41 and Kanami still has almost 3 times the str of Jericho.
Also all of Jericho skills are bad having cooldown and not making up for the effect (her best skill is a 1 turn cooldown attack on par with everyones 0 turn cooldown attack with 1/3rd to 1/4th of the str stat)