Hello, I have a site with 3 large Ficus maclellandii 'Amstel King'. They're currently dropping a decent amount of green, yellow, and brown leaves, one tree more than the others. I know this is common for them in the winter but the staff on site are under the impression that its quite a lot more than the previous years. They have not undergone any changes in temperature, light, or watering that I know of. They receive a daily 30 minute cycle soak of 10 minutes on, 10 minutes off, then 10 more minutes of water. We have checked and the irrigation is fully functional. I am thinking this may just be the normal winter occurrence, but I thought I would see if anybody else has any input. Since I have had this site they have been very happy and growing like crazy. As far as I know the soil has never been changed and they have not been fertilized. They are starting to outgrow the collar around the trunks so this may be adding some stress. See photos. Thanks!