As long as the Tester amendment is in the final bill is wouldn't affect the garden of someone that sells at a farmers market, but right now Big Ag is looking to kill the current bill and try to get the amendment removed. If the amendment doesn't stand the interpretation will be up to the current head of the FDA.
http://farmandranchfreedom.org/Tester-Hagan-explanation
http://farmandranchfreedom.org/Tester-Hagan-explanation