Homeward, 11 x 14, oil
I'm often asked about my palette, and in particular what greens do I use to paint my trees?
I don't actually use tube greens on my palette. I mix all my greens from the primaries. Typically, I have two or three kinds of each of the primaries, plus white, and I can mix all the colors I need from them.
My blues are Ultramarine, Cerulean, and Ivory Black. That's essentially a reddish blue, a greenish blue, and a low chroma blue.
Sometimes I use Cobalt instead of Ultramarine. Cobalt isn't really reddish blue, true, but it's still closer to violet than Cerulean.
Sometimes I use Prussian Blue instead of Cerulean. Prussian, like Phthalo is a very strong color and just a teeny bit will go a long, long way. If you're not careful it'll blow up in your face. So to speak. Cerulean is a much gentler, yet rich color and user friendly. I do recommend my students to use Cerulean until they've become very comfortable mixing colors.
My yellows - I have a cool yellow, a warm yellow and low chroma yellow; Cadmium Lemon, Cadmium Yellow Deep, and Yellow Ochre.
Sometimes I just mix a warm yellow with Cadmium Lemon and TOR (Transparent Oxide Red), which gives me a nice rich warm yellow, and one less tube to carry.
Yellow Ochre is really handy, since mixing a darker value yellow can be a bit of work.
With these blues and yellows, you can mix them in different combinations to get all kinds of greens very quickly. Ivory Black and Cad Yellow makes a beautiful rich dark olive green. So does Ultramarine + Yellow Ochre. Cerulean + Cad Lemon makes a brilliant light green.
Just lay a couple of yellows and blues out on your palette and play around with it. You may be surprised at what you can mix when you're not trying to mix any specific color.
Add to these greens the reds, and of course the white, and you have further expanded the scope and the complexity of possible greens.
Tube greens are convenient, to be sure, but if you find that all the greens in your landscape paintings starting to look too similar, may be it's time to ditch those tube greens and start mixing them from your primaries.