My least favorite color is green.  It seems to take over paintings if too saturated.  Reality, especially landscapes, displays many variations of green.  And it is important to note that green makes water wet in a painting.  Combining various blues (cobalt, ultramarine, cerulean, phthalo, Prussian) with various yellows (cadmium, cadmium lemon, Indian, Hansa, ochre, Naples) produces a wide spectrum of green favoring either warm or cool depending on the ratio mix.  Seldom do I use a green from a tube, except for chromium oxide green.