A shot taken with my iPhone 6s Plus in Leverkusen, Germany.

Gravitropism is a turning or growth movement by a plant or fungus in response to gravity.

Wikipedia tells us …

It is a general feature of all higher and many lower plants as well as other organisms. Charles Darwin was one of the first to scientifically document that *roots show positive gravitropism and stems show negative gravitropism*. That is, roots grow in the direction of gravitational pull (i.e., downward) and stems grow in the opposite direction (i.e., upwards). This behavior can be easily demonstrated with any potted plant. When laid onto its side, the growing parts of the stem begin to display negative gravitropism, growing upwards.

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