Some of the tropical vegetation in the hills above Puerto Vallarta, Mexico, is so thick that little sunlight reaches the surface. There is seldom enough sunlight for crabgrass when it has to compete with humungous trees, vines, bamboo, palms, and other plants absorbing the sunlight in the canopy. In addition to perpetual darkness, the thick cover of dead leaves and debris inhibits weeds from growing. I found that where man has cut roads up the forested hills, weeds seize the opportunity for sunlight and grow along the "corridor of light."

I took the picture of a struggling vine along a road.

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