Rooting-Hormones: method
Quick answer
method for Rooting-Hormones: Auxins are the primary hormones regulating adventitious root formation in cuttings. Indolebutyric acid (IBA) and naphthaleneacetic acid (NAA) are synthetic auxins that stimulate root initiation by upregulating gene expression for root formation. Applied auxin accumulates at the cut base, triggering dedifferentiation of parenchyma cells into meristemoids that form root primordia.
Start here:
- 1. Use 0.1% IBA (1000 ppm) for easy-rooting herbaceous species
- 2. Use 0.3-0.5% IBA for semi-hardy shrubs and trees
Why method matters for Rooting-Hormones
Auxins are the primary hormones regulating adventitious root formation in cuttings. Indolebutyric acid (IBA) and naphthaleneacetic acid (NAA) are synthetic auxins that stimulate root initiation by upregulating gene expression for root formation. Applied auxin accumulates at the cut base, triggering dedifferentiation of parenchyma cells into meristemoids that form root primordia.
How to handle method on Rooting-Hormones
- 1
Use 0.1% IBA (1000 ppm) for easy-rooting herbaceous species
- 2
Use 0.3-0.5% IBA for semi-hardy shrubs and trees
- 3
Use 0.8% IBA for difficult-to-root hardwood and conifers
- 4
Apply rooting hormone to basal 1 inch of cutting — dip and tap off excess
- 5
Powder formulations are most common; gel is useful for horizontal cuts
- 6
Do not apply to leaves or green stems — can cause burn
- 7
For species sensitive to auxin: use talc-based powders diluted with inert filler
Keeping Rooting-Hormones on track
Use appropriate hormone concentration for species difficulty level; apply to basal 1 inch only; store in cool, dark conditions.