Abstract: A method of forming a packaging for flowers or plants, wherein a sheet of material is unrolled and fed into a thermal moulding machine for heating and subsequently bringing a portion of the sheet of material into a first form, whereafter that portion of the sheet of material is punched and the punched-out portion is further processed into a finished packaging, wherein the first form of the portion of sheet material is shaped substantially as a cylindrical mould, suitable for receiving a plant pot or the like, and this cylindrical mould is provided with a top rim, adjoining to which in a first form is a downward tapering support collar and in that after punching, during the further processing, the support collar is folded upward in relation to the cylindrical mould so as to ready the packaging.