Gibberellic acid

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Gibberellic acid can also influence the timing of flowering, flower gender, flower size, and number of flowers.

  • Gibberellic acid is sometimes used in laboratory and greenhouse settings to trigger germination in seeds that would otherwise remain dormant.
  • It is also widely used in the grape-growing industry as a hormone to induce the production of larger bundles and bigger grapes, especially Thompson seedless grapes.
  • In the Okanagan and Creston valleys it is also used as a growth replicator in the cherry industry.
  • It is used on Clementine Mandarin oranges which may otherwise cross-pollinate with other citrus and grow undesirable seeds.
  • Applied directly on the blossoms as a spray, it allows for Clementines to produce a full crop of fruit without seeds.
  • Gibberellins have a number of effects on plant development.
  • They can stimulate rapid stem and root growth induce mitotic division in the leaves of some plants and increase seed germination rate.

Use strong solution, 500 ppm

  • On very hard to germinate seeds and a 250 ppm on seeds that are just hard or slow to start.
  • Seeds enclosed in a hard coat may be submit to a higher concentration, 750-1000 ppm.
  • You can scarify the seeds at first.
  • Soak seeds for at 24 hours and at most three days for the ones enclosed in a hard coat.
  • Keep the seeds at room temperature with occasional careful shaking.
  • The seeds may then be sown.
  • Don’t use it on easy to start seeds unless you dilute it greatly like 25-100 ppm and soak them only for 2-3 hours.
  • Normal easy-to-sprout seeds will become very elongated and stretched out, then die if GA3 is used on them. Concentrations of about 2 ppm can cause tubers to sprout earlier.
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