The invention relates to an aqueous composition which is used to protect and strengthen plants, comprising: polyethylene glycol at a concentration of between 2 and 10 grams per litre of composition, whereby said polyethylene glycol has a molecular weight of between 6000 and 8000 grams/mol; vitamin A or a derivative or precursor thereof, including mixtures of same, at a concentration of between 0.1 and 10 grams per litre of composition; and at least one red colouring agent at a concentration of between 0.1 and 10 grams per litre of composition, said colouring agent enabling the passage of light at wavelengths greater than 600 nanometres.
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