From the Greek tropos meaning “a turning”, a tropism is the response in a plant’s growth due to an external environmental stimulus. There are many types, such as:
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- Hydrotropism, growth in response to water for example when the roots grow towards areas of higher moisture
- Phototropism, in response to light
- Thermotropism, in response to temperature
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To name but three but I think this rowan tree in Newton Wood is displaying traumatropism, that is the regrowth due to earlier damage or trauma.
Loads of point if you can fit this on a Scrabble board.
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