"Dad why we plant roses near the vineyard?"
"Because so the roses will protect the grapes"
"Dad?"
...
"The roses can't fight, they are only flower!"
"Yes but with the help of roses we can understand the problem of our vineyard, with the help of that trees we can protect our yard from the wind"
"So tree and roses are our friend!"

Only many years later I understand what my father meant, we can't speak with nature, but we can observe it, we can "design" for help us in order to understand the diseases that can afflict the crop. Roses, for example, are very sensitive to different diseases, and if such a rose gets sick it means that the vineyard has a certain pathology.

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