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I was thinking of growing a single white flower and dying it blue for my girlfriend and I's 3 year anniversary, but I'm not sure of the best method.
I've seen the 'cut the stem and put in food colouring water' method, and it isn't quite as vibrant as i'd like.
I was considering watering the flower with food colouring water for its entire life, but I have no clue if this would prove any more effective.
Does anyone know of anything I could do to achieve this?