Q.Silver Dollar Eucalyptus Cold Hardness
the eucalyptus is 2 years old and in a pot
Certified GKH Gardening Expert
Unfortunately, you are well outside of the USDA zone of the specimen. This can only live through the winter, outdoors, from zones 10 and 11. It can withstand down to about 50 degrees. Since this is in container, though, I wouldn't let it be exposed to temperatures below 55 or 60. Being a container specimen it can be a little more sensitive to lower temperatures than that of those in-ground.
It is very important to note that this specimen isn't one that is recommended for container life. They will quickly outgrow anything that would be light enough to carry. Some species of these trees can get up to over 100 feet tall, and will require bonsai like care to keep it small enough to bring in during the winter. Even then, this does not always work with the ultra sensitive root system. This means that there is a likelihood of killing the tree.
https://www.gardeningknowhow.com/ornamental/trees/eucalyptus/tips-growing-eucalyptus.htm
