A liquid-supplying device configured to supply liquid to at least one plant contained in a pot comprising a substrate , the liquid-supplying device comprising at least: ∘ A hydraulic conductor configured to convey the liquid by capillary action and comprising at least one first end and at least one second end ; ∘ A tube comprising at least one first outlet and at least one second outlet , the second outlet being intended to be in contact with the substrate , the tube housing at least one part of the hydraulic conductor ; The supply device being characterized in that : ▪ the hydraulic conductor forms a loop comprising an elbow and at least a first and a second portion of the hydraulic conductor extending respectively on either side of the elbow , preferably said at least one loop being intended to be placed at least partly in contact with the substrate ; ▪ the loop is arranged outside the tube and at least one portion exits through the second outlet of the tube ; ▪ the first end and the second end of the hydraulic conductor exit through the first outlet of the tube ; ▪ at least one end of the hydraulic conductor among the first end and the second end is intended to be in contact with a source of liquid ; ▪ the tube comprises at least one opening configured to allow air circulation between the interior and exterior of the tube , said at least one opening is carried by a side wall of the tube and is arranged between the first outlet and the second outlet of the tube , said at least one opening extends in the form of a longitudinal slot from the second outlet of the tube and towards the first outlet , the diameter of the tube being dimensioned so that, when the hydraulic conductor is housed in the tube and is saturated with liquid, there is a passage in the tube not occupied by the conductor and capable of allowing air to circulate between the first and second outlets of the tube . ∘ A hydraulic conductor configured to convey the liquid by capillary action and comprising at least one first end and at least one second end ; ∘ A tube comprising at least one first outlet and at least one second outlet , the second outlet being intended to be in contact with the substrate , the tube housing at least one part of the hydraulic conductor ; ▪ the hydraulic conductor forms a loop comprising an elbow and at least a first and a second portion of the hydraulic conductor extending respectively on either side of the elbow , preferably said at least one loop being intended to be placed at least partly in contact with the substrate ; ▪ the loop is arranged outside the tube and at least one portion exits through the second outlet of the tube ; ▪ the first end and the second end of the hydraulic conductor exit through the first outlet of the tube ; ▪ at least one end of the hydraulic conductor among the first end and the second end is intended to be in contact with a source of liquid ; ▪ the tube comprises at least one opening configured to allow air circulation between the interior and exterior of the tube , said at least one opening is carried by a side wall of the tube and is arranged between the first outlet and the second outlet of the tube , said at least one opening extends in the form of a longitudinal slot from the second outlet of the tube and towards the first outlet , the diameter of the tube being dimensioned so that, when the hydraulic conductor is housed in the tube and is saturated with liquid, there is a passage in the tube not occupied by the conductor and capable of allowing air to circulate between the first and second outlets of the tube . <EOS>