The invention relates to an insert container for plant pots with a base, at least one side wall, which adjoins the base with a lower edge, is formed with an upper edge open at the top and surrounds an interior, a longitudinal axis extending perpendicular to the base, supports arranged on the base and extending in the direction of the longitudinal axis, at least one water-permeable watering device arranged on the base and at least one indentation which extends in the direction of the longitudinal axis, in the at least one side wall.