Method for colouring a flower on a pot plant, comprising the steps of (i) providing an injecting means which is provided with an injection needle, (ii) filling the injecting means with a quantity of colouring liquid which is non-toxic to the pot plant, (iii) arranging in the stem of the flower a bore with a diameter corresponding to the diameter of the injection needle, (iv) inserting the injection needle into the bore, (v) injecting the stem with the quantity of colouring liquid, and (vi) removing the injection needle from the stem following the injection, and pot plant with at least one flower which is coloured with a colouring liquid introduced via the stem of this flower.
