why is Flora defined, but still nil?

Your code is going like this, it seems that your generate function cant check the variables targ, and node.

So now it will say: local plant = flora:FindFirstChild("medBushA") (instead of) local plant = flora:FindFirstChild(targ) targ isn't a thing but you still trying to find it in your flora folder, and for the p2.PrimaryPart.CFrame = node.CFrame, it's littery the same thing cause node is a variable and a variable doesn't have a CFrame, but yeah here is the correct code you can test it and leave me a like if it worked ;)

wait(2)
ReplicatedStorage = game:GetService("ReplicatedStorage")
floraEvent = ReplicatedStorage:WaitForChild("floraEvent")
flora =  ReplicatedStorage:WaitForChild("Flora")


function generateFlora(targ,node)
    local plant = flora:FindFirstChild("medBushA")  
        local p2 = plant:Clone() 
    p2.Parent = game.Workspace 
    print("Planted!")
--  p2.PrimaryPart.CFrame = node.CFrame

end 

floraEvent.OnClientEvent:Connect(function(...)
    local args = {...}
    for _, arg in pairs(args) do
        print(args[1].Name.."Located") 
    end

wait(.1) print (args[4]) print (args[5]) 
local v = args[4]
generateFlora(v, args[5]) 
end)