Posted: 17/10/2015 at 11:56
Hi KatyAnn, you're not doing anything wrong. Depending on variety, new leaves are often green and turn red later. Indeed, on some varieties they start off red and then turn greener later in the year. There is probably more green chlorophyll being produced as a response to the potting-on as the tree tries to make as much food as possible as light levels reduce. It will resume normal behaviour next year.