Poinsettia Plant Yellow Leaves. If the stems still look okay the plant may survive but the appearance of the plant may suffer. They should look like small fresh buds with red or green tips.
By the same token over fertilization can burn the leaves yellowing them as well. This can result in leaves gradually turning yellow before falling off. They turn yellow and off they fall.
However over fertilization can result in yellow leaves as well.
Some varieties have darker green foliage than others and others are variegated with yellow or cream colored markings in the leaves. 06012021 Your poinsettia with yellow leaves could be caused by a mineral deficiency a lack of magnesium or molybdenum could turn leaves yellow. 10122015 Yellowing leaves on poinsettia. Can usually be seen on both upper and lower surface of the leaf.