A plant treatment means for introducing a treatment agent into a plant. The plant treatment means comprising an unpressurized reservoir (11) intended to contain a plant treatment agent and adapted to be fixed to a plant stem (S) and/or leaf. The plant treatment means further comprises at least one probe (14) which is able to penetrate the epidermis of the plant stem and/or leaf. The probe (14) having a fluid pathway to carry treatment agent from the reservoir (11) to the plant over a period of time. The fluid pathway is preferably constituted by a rigid porous capillary element extending between the reservoir and the free end of the probe. The reservoir (11) is associated with a mounting (12) which is able to support the reservoir on the plant stem (S).