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Indole Acetic Acid
Indole acetic acid, also known as IAA is an Auxin. This colorless solid is a native plant compound, potent and the most important and active auxin. IAA has many different effects, as all auxins do, such as inducing cell elongation and cell division with all subsequent results for plant growth and development. On larger scale, IAA serves as signaling molecule necessary for development of plant organs and coordination of growth and helping plants find light.

IAA functions

  • Increase plant size
  • Increased root growth
  • Helps plants find light
  • When combined with other plant hormones, it helps them function better. Such as IBA, NAA and BAP.
  • Growth stimulant
  • Increase the growing season of some tuberous plants when applied late in the season.


For more info on auxins, please see the auxin page
growth regulators for plants