A plant holder includes at least one cell which defines a plant position and which is configured to receive plant material during use. A clamp includes a clamping position in which plant material is to be clamped in the cell and an open position in which plant material is to be arranged in and/or removed from the clamp. The clamp is provided with at least one actuator which is configured to be engaged externally in order to open the clamp. A system includes such a plant holder. A method of processing a plant holder including a clamp, includes the steps of: opening the clamp； arranging plant material in the clamp and/or removing it therefrom； and closing the clamp.
