Tree roses are not a separate group of roses. Instead, it is a special breeding form in which certain garden rose varieties are grafted onto a master - usually a particularly robust wild rose. A rose stem is more at risk of frost in winter than other roses.
Most roses are hardy, but the graft site needs protection!
Preparing tall stems for winter
Due to their growth habit, standard roses are much more exposed to frost than low rose bushes; in addition, the sensitive grafting point - which is located directly under the crown - cannot be protected by piling up. It is particularly important to protect the crown from drying out, i.e. from the winter sun when the ground is frozen at the same time. Most roses don't freeze to death, but wither when the ground is frozen hard and the roots can no longer absorb water. For optimal winter protection, tie fir branches into the crown to protect the sensitive grafting area and then put a jute sack (€10.99) or a special winter fleece over it.
tips
Do not use plastic bags! Underneath, condensation forms, which in turn promotes the formation of rot.