why has my Hummel's Sunset turned all green instead of yellowish colour?

chiwen. This may have something to do with the quality of the light in the fall. @valleylynn might have a better answer.

Hi Chiwen, and a great big to ATP.
Can you post a photo of your plant, and give us some information on where you live (growing zone), Is it in a container or the ground? How much light is it getting?
This plant will turn green for a while after replanting and/or when over fertilized.

I have that one and it seems to color up when it is very dry. Mine was not green but I did not get the usual vivid pretty colors because we had so much rain and little sun this summer.

Welcome chiwen! I read somewhere that 'Hummel's Sunset' will have more colorful foliage in cooler weather.

I read the same thing Lin, but forgot to post it.
But the information is here now. Good job.

LOL Lynn, I don't know much about Crassula at all but I did remember reading about that pretty 'Hummel's Sunset' recently ... gorgeous plant!

Same here. It is a beauty when it gets the cooler weather and colors up.