Growing Grass from Color Ramp? I have added a plane with a color-ramp as texture and added a particle system (grass) as seen below.

what I need to do is make the grass grow from the green area, not the blue area and not from faces or vertex

Is there a way to do that?

thanks.
You need to bake a copy of the node in a grayscale (where the value correspondes to the density of your grass), and use it in your particles' textures with the option to influence the density.