No need to split qualities per tree. Just the whole tree has a chance to output fruit of equal quality or lower. This also introduces a very large variance in numbers of quality fruit for farms until you get to very large farms/factories which is another interesting logistical problem on Gleba since ...

Yea it is really irritating when trying to build gargantuan ships. Even just big ships can get annoying.

+1

Made a forum account just to post this; Quality Seeds make Quality Tree which have a chance to produce Quality Fruit.
For example uncommon seed would produce an uncommon tree, the uncommon tree when harvested would have a 10% chance for each fruit to be uncommon, if not then it would be common ...