In climates where temperatures rarely drop below 10 degrees Fahrenheit, making a protection in the winter does not become necessary.
Where the temperature falls below 10 degrees Fahrenheit but rarely below zero, the protection is optional. In climates where temperatures are below 0 degrees Fahrenheit, protection becomes mandatory, and the less temperature rise has the greater the protection.
The big growers of roses in the north usually practiced different methods of protection in the winter. One of them is to dig a trench to the height of the rose, from the root zone out.
Then they must push the entire bush in the trench and cover with soil. In spring, uncover the rose and its vertical position to define a new growing season.
