Symptoms
During the growing season you can instantly recognise reverted shoots as pure green growths emerging from among the branches of a variegated plant. As these shoots contain more chlorophyll than variegated ones, they are more vigorous and can eventually take over the plant.
This is mainly a problem with variegated trees and shrubs, but can also affect coloured Phormium hybrids, with plants starting to grow pure green leaves. Also variegated plants such as hollies can produce all white or pale yellow shoots, but these are very weak and do not take over in the way that green ones do.