I'm sure you know the spiel by now, everyone's making tier lists for roles and it sounded fun to me to try. I bring this to you with a massive yet unknown amount of hours in the garden, so I might know what I'm talking about! Lets get right into it.
F : Oooh, hatchets?
Has never seen a plant grow and never will
Thinks hatchets are top-tier weapon and the station is stupid for leaving all of them out
Usually bald
Will usually SSD after being brigged, bwoinked, or finding no victims to attempt to dice
D : Farmer John
Plants nothing but unmodified food for the chef
Does not understand the biomass generator
Unwilling or unready to learn the slightly more advanced side of roles
The garden usually turns to a bunch of wheat then dies/overgrows as the farmer gets bored
C : Memers
Knows about plant gene modification but only uses it for one thing: usually Bluespace Activity
Only understands plant potency stat, everything else is pointless to them
Only slightly better than previous tiers because they've begun learning the role but not when to go ham with plants.
They probably know how to get and produce Cannabis. Do they know how to mutate it? Maybe. Do they know about CBD's usefulness? Probably not. God help you if they find Omega weed.
Some advanced members of the F tier will sneak into C tier by discovering Death Nettles and using those inplace of hatchets. They are only slightly higher tier because they use some game mechanics to be a turd.
B: Botanical Researcher
May not understand the specifics of each trait and stat, but understands the platform to modify them and is willing to learn
Makes helpful things (but typically mundane, like wood or leather goods) for the crew and is generally friendly
Knows about Earthsblood, and that its used for making trays self sufficient, but aside from that is unsure of its properties.
Knows how to hack their vendor but may mess up and need an engineer's help.
Churns out food from reharvestable plants for the chef. Mass fields of wheat are a thing of the past!
A: Phytomancer
Plants bend to your will. You know what every trait, chem, and style of plant can do, and know how to implement them.
Earthsblood + Mannitol mixes for medbay
Meatwheat for the Cloner's biomass and Kitchen
400k battery cells for robotics + anyone else
Durathread factory + armory
Plants that recharge the cells on your person allowing for instant e-gun refills
You even know what the mining flora does, even if no miners ever bring you any.
S+: Kudzu
You know how to obtain Kudzu, how to wrangle it, and use it for either horrifying biohazard purposes or for farming massive amounts of rare materials. You've learned all there is to know about plants, have fun!
As with all of these tier lists, they're mostly meant to be a silly guide. I'm sure there's some small things I've overlooked but I hope you had a giggle, and if anyone has any actual questions about botany I'd be happy to answer!