In some cultures a green front door represent growth because of it is the shade of green plants in nature. In China, for example, green is connected to life, east and the sunrise. If you’re environmentally conscious, you’ll do well with this color for your home.
A green door also means prosperity because it is the same color as dollar bill currency in the United States. Some people may paint their front door green to attract and humbly celebrate wealth.
A green exterior door can signify safety. This meaning for green is represented with the green signal on a traffic light. It means that it is safe for a person to proceed into traffic. You can show others that your home is a safe haven by painting your front door green.
http://www.homecurbappeal.com/what-does-a-green-front-door-mean-meaning-of-a-green-exterior-door/
I had to search each color separately to get any older meanings 
Green is my favorite color, and I've always insisted on keeping our home a safe space, no yelling, fighting or drama.
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