While reading this question and the only current answer, I was reminded of a standard set up on Cooking.SE that might be apropos here. What standards should we apply around gardening answers?
Obviously we will very often have many applicable options from the different answers, and no particular need to pick the "most authoritative"; however it would be informative in answering/researching questions to know where to begin with respect to 'who' we should look to for background data.