If only to use six colours, then the six primary colours would be best, but of white or black, you may consider as tints and tones, or use one less colour,

Green, Blue, Orange,
Yellow, Purple, White,

green for leaves,
blue for shade , of green
orange for wood, with blue and purple values
yellow for highlites of green
purple for shadow and
white for tinting all colors,

orange purple and blue replace blacks as background contrast values

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