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    $\begingroup$ Try MeshShading -> {Green, Yellow} see the docs on MeshFunctions >> Details on how MeshFunctions work. $\endgroup$ Commented Mar 3, 2017 at 16:35
  • $\begingroup$ you can use both ... MeshStyle -> Red, MeshShading -> {Green, Yellow} ...; the two options do different things. Regarding the default mesh functions there is a table in MeshFunctions>> Details showing the default settings for various *Plot* functions. For Plot, the default mesh function uses the x values (#1& is the first argument) $\endgroup$ Commented Mar 3, 2017 at 16:44
  • $\begingroup$ What does the #1& refer to? $\endgroup$ Commented Mar 3, 2017 at 16:48
  • $\begingroup$ Do you want Plot[x^3, {x, -20, 20}, PlotLabel -> "Title", PlotStyle -> Thick, MeshStyle -> {Directive[Green, PointSize[Medium]], Directive[Yellow, PointSize[Medium]]}, MeshFunctions -> {#1 &, #1 &}, Mesh -> {Range[-20, 20, 2], Range[-20, 20 , 4]}] $\endgroup$ Commented Mar 3, 2017 at 16:49
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    $\begingroup$ @Quantitative -- do not sabotage this site. $\endgroup$ Commented Apr 19, 2017 at 22:08