Q.Coffee bean plant – trunk changing color – normal ?
I purchased some coffee bean plants (Arabica) separated, them & they seem to be growing normally; but, several of them (15 %)seem to be changing their trunk color from ( from white to coffee brown) is this normal ? E. Moreau

Certified GKH Gardening Expert
I will need to see a photo. This will help me to see the issue. These will normally change many colors from white to dark brown and still be considered normal.
Are you noticing any other symptoms? If this is paired with excessive leaf drop, or spotting, then you might be facing an issue. If not, then I suspect that this is a normal behavior from the trees.
This article will help you care for these: https://www.gardeningknowhow.com/houseplants/coffee/growing-coffee-plants-indoors.htm