The reason why Mexicans use to put petals on the ground is to illuminate the path of the deceased on the "día de muertos" so that they can visit their relatives.
Tradition on "día de muertos".
Tradition dictates that people, on the "día de muertos," use the marigold flower petals to make a path erected to their portrait or grave, in order to illuminate their path and thus they, the souls, can visit their relatives, who remember them.
The "día de muertos" is based on the perception that the souls of the deceased can be preserved on a spiritual plane as long as they are remembered by their relatives through the generations, which is reaffirmed every November 1st and 2nd.
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