griselinia littoralis help please
 

Hi,

I have a couple of these shrubs. The ground they are on is covered with weed control fabric and small stones. They have grown to about 7 feet in about 5 years, in general they appear in good enough health but at this time of year a lot of the leaves turn yellow and fall off, is this normal and nothing to worry about or is it a sign that something is not right. Any replies appreciated.

Thank you