We moved to Victoria about 1 year ago, and these large conifers behind our house were very green at the time (August) with a very few brown bits. They stayed very green all through winter and spring. Now, however, they seem to suddenly be yellowing in patches all over, it's pretty evenly distributed. Is this normal? Are they possibly responding to too dry or too wet conditions? Do they need anything? Love these trees and am just concerned about their wellbeing. Photos from today: