The invention relates to an electrical heating device allowing temperature maintenance which ensures the survival of arboricultural plantations during frosty periods. This invention is noteworthy in that, according to Figure 1, it consists: of a regulating cabinet AR, receiving electricity from the mains at the terminal B and including an alarm A1 and a probe S, distribution lines L1, L2, ... Ln supplying the sealed boxes Be and distributing the electrical power to the heating tapes (cords) Cc held in place along the plant by the isothermal jacket E via the distribution element C. The invention finds its main application in the protection of arboricultural plantations, in particular of Actinidia (Kiwi fruit). <IMAGE>
