I noticed a couple of weeks ago the leaves on a few plants were turning white/yellow from the edges. I didn't think much of it at the time. Now on closer inspection as I am doing my spring tidy, most of the plants in a corner of my garden are following and their leaves are changing colour from the edges inwards. Even some new bedding plants are following. I have no idea what to do??? or what is causing this?
Photos can be found here. http://s1347.photobucket.com/user/nsket/library/Garden%20Problems%201