Powder Rooting Hormone
Definition - What does Powder Rooting Hormone mean?
In horticulture, powder or powdered rooting hormone is a commercially available form of plant rooting hormones sold at specialty garden shops and many hydroponics supply shops.
In addition to powder rooting hormones, there are also liquid and gel forms available. Powder forms of rooting hormones are considered ready-to-go out of the package; they don't require mixing with water first. While convenient, this means that when using powdered hormones, their concentration levels cannot be altered.
Rooting hormones help promote new root growth in young plants, and typically contain a class of plant hormones known as auxins. They are most commonly used during the cloning process on plant cuttings taken from a mother plant, but they can also be used in the seed propagation and germination stages.
MaximumYield explains Powder Rooting Hormone
Like liquid and gel rooting hormones, powder rooting hormones mainly contain a synthetic form of auxins, specifically indole-3-butyric acid (IBA), to initiate adventitious root production. This auxin is used as a rooting hormone for seeds and cuttings, and is present in most rooting products on the market.
Unlike liquid rooting hormones, powders have a long shelf life and do not require refrigeration. In fact, powdered rooting hormones can last many years if they are properly stored (kept dried and never at risk of cross contamination from sick plants)
Many commercial growers prefer working with powder rooting hormones because of its stability and ease of use; it doesn't require dilution with any type of liquid before use. To use a powder form rooting hormone product, a cutting is simply dipped in the powder, then tapped lightly to remove the excess. The cutting can then be placed in the desired medium for rooting.
Like with liquid and gels, it is advised to NOT dip the cutting directly in the entire package of powder, rather, use a smaller container. Using small batches of powder for dipping cuttings reduces the likelihood of contamination and makes the most efficient use of the powder.
You can increase the amount of powder that sticks to the cutting by first scoring the cutting or dipping it into water to moisten things up, but be warned that this may increase the likelihood of contamination from cutting to cutting and will use up the batch of powder more rapidly.