Plant protection system for plants grown in rows, comprising: - vertical posts aligned in at least one row, designed to be embedded in the ground, each comprising an upper zone designed to be located above the plant canopy, - a framework integral with the upper zone of the posts, capable of adopting a retracted position or a deployed position transversely perpendicular to the row of posts, said framework comprising framework modules each carried by a post and comprising at least one deployment arm (201d, 201'd, 201g, 201'g) connected to the corresponding post by its proximal zone in an angularly movable manner, between a vertical and upwardly oriented position corresponding to the retracted position of the framework, and a horizontal or inclined position with respect to the ground corresponding to the deployed position of the framework, said framework further comprising at least one lateral elongate element fixed to the distal zone of the or one of the deployment arms of each framework module, said at least one lateral elongate element extending parallel to the row of posts and to the ground, - a flexible protective cover having an upper face and a lower face, said protective cover being carried by the framework and being able to occupy: - by deploying the framework, an unfolded position in which it extends over the plants and forms a protective screen, - by retracting the framework, a folded position above the top of the row of plants, - means for maneuvering the frame between the extended and retracted positions and for holding it in either position or in an intermediate position, said installation being characterized in that each framework module comprises a guide head provided for guiding the maneuvering means, each guide head being fixed to the corresponding post, at a distance above the proximal end of the or each deployment arm (201d, 201g), characterized in that the or each deployment arm of each framework module is biased towards the deployment position of the framework by elastic restoring forces internal to the or each deployment arm (201g, 201d), the latter being formed from an elastic elongate element. - vertical posts aligned in at least one row, designed to be embedded in the ground, each comprising an upper zone designed to be located above the plant canopy, - a framework integral with the upper zone of the posts, capable of adopting a retracted position or a deployed position transversely perpendicular to the row of posts, said framework comprising framework modules each carried by a post and comprising at least one deployment arm (201d, 201'd, 201g, 201'g) connected to the corresponding post by its proximal zone in an angularly movable manner, between a vertical and upwardly oriented position corresponding to the retracted position of the framework, and a horizontal or inclined position with respect to the ground corresponding to the deployed position of the framework, said framework further comprising at least one lateral elongate element fixed to the distal zone of the or one of the deployment arms of each framework module, said at least one lateral elongate element extending parallel to the row of posts and to the ground, said framework comprising framework modules each carried by a post and comprising at least one deployment arm (201d, 201'd, 201g, 201'g) connected to the corresponding post by its proximal zone in an angularly movable manner, between a vertical and upwardly oriented position corresponding to the retracted position of the framework, and a horizontal or inclined position with respect to the ground corresponding to the deployed position of the framework, said framework further comprising at least one lateral elongate element fixed to the distal zone of the or one of the deployment arms of each framework module, said at least one lateral elongate element extending parallel to the row of posts and to the ground, - a flexible protective cover having an upper face and a lower face, said protective cover being carried by the framework and being able to occupy: - by deploying the framework, an unfolded position in which it extends over the plants and forms a protective screen, - by retracting the framework, a folded position above the top of the row of plants, - by deploying the framework, an unfolded position in which it extends over the plants and forms a protective screen, - by retracting the framework, a folded position above the top of the row of plants, - means for maneuvering the frame between the extended and retracted positions and for holding it in either position or in an intermediate position,