Abstract: The invention provides a shelter comprising a wall member, a support ring to hold the wall member in its expanded conformation and, optionally, a ground support member to support the shelter on the ground. The wall member is adapted to have a flattened collapsable conformation or an expanded conformation. In use, the wall member is in the expanded conformation in which the wall member circumferentially encloses an interior space and defines an open bottom. The interior space accommodates the plant to be protected. The expanded shape of the wall member may be conical, with an opening at the top. The support ring retains the wall member in its expanded conformation by abutting an exterior surface of the wall member. The support ring has a decomposable portion adapted to deteriorate over time.