People add food colouring to water used to water plants in order to alter the colour of the plant. This alteration is done to show children how plants absorb water or to make white flowers more colourful and decorative.
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Effects on growing plants
Adding food colouring to a growing plant may slightly alter the colour of the plant, according to the University of Illinois.
Effects on cut stems
Fresh cut flowers, especially white or light-coloured ones, will change colour when food colouring is added to their water.
Different colours of food colouring can be injected into different areas of a white flower stem to produce rainbow-coloured flowers. These flowers are often sold as novel decorative bouquets.
According to the University of Illinois, food colouring will not harm plants.
The food colouring dissolves in the plant's water supply and is absorbed by the plant along with the water. The colourful water is drawn up the plant's stem and distributed within the plant's leaves and petals.
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