Is ginger turned green still good?

No, ginger that has turned green is no longer good. The green colour indicates that the ginger has been exposed to light and has begun to produce chlorophyll. This process is called "greening" and it results in the ginger losing its flavour and becoming bitter. Additionally, green ginger may also contain harmful compounds that can cause stomach upset and other health problems. Therefore, it is best to discard any ginger that has turned green.