Master Gardeners are volunteers trained by land grant universities. Each county has an extension office purposed with educating the public. There's currently a class of 24 or so, mostly Villagers finishing a class that has been running since early Feb for 5.5 hours a week, with books and materials that weight the same as a man's golf bag full of clubs.
MG's disseminate info thru plant clinics and other presentations in Sumter Co. at the extension annex on 466 and ext ofc in Bushnell as well as some rec center programs. Sunday paper runs info on plant clinics.
Not only does one have access to MGs and staff of the extension ofc at plant clinics, at which virtually any issue regarding plants and soil may be solved, but UF's experts back the program up with lab work as needed.
Sumter County Extension Office ? Solutions for Your Life - UF Institute of Food and Agricultural Sciences