score:2

Accepted answer

You need to use three series for each color separately.

http://jsfiddle.net/sbochan/w23mbjx5/

Example:

series: [{
        data: [1,2,3,null,null,null,4,5,6],
        color: 'green'
    }, {
        data: [null,null,null,null,2,8,4],
        color: 'yellow'
    }, {
        color: 'orange',
        data: [null,null,3,3,2]
}]

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