Ser07700, I didn't quite understand what you meant by "seeds"). In that situation, I just bought heroes from the tavern and went to fight monsters.
I'm not a very good player, so it's not easy for me to win. *But you wrote it in such a way that now I think you completed it in no time.*

alextet, sometimes this happens with the AI for some reason. In my case, the Sylvan faction developed successfully when I was playing. But the Dungeon faction just stood still. So, I don't know what to do about it.