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: [[Auxin]] is [[photophobic]] so it will build up on the darker side of a [[plant]]. This causes [[Cell (Biology)|cells]] on the shaded side of a [[plant]] to elongate, bending a [[shoot]] towards the source of [[light]].
: [[Auxin]] is found in high [[concentration]]s in [[shoot]] tips.
===Using Auxin===
: Gardeners use [[auxin]] to encourage cuttings of [[plant]]s to grow new [[root]]s when they are planted.
: [[Auxin]] can be used to kill [[plant]]s by causing them to grow too fast, using up their stores of [[energy]]. Since auxin is sprayed on [[leaf|leaves]], [[plant]]s with larger [[leaf|leaves]] will [[Absorb (Biology)|absorb]] more and are more likely to die.