Rooting hormone powders

Which rooting hormone powder is best I only want to buy one type? Number 1, 2 or 3 strength? For instance, would it matter if number three strength was used on softwood cuttings?

 

It really depends on the type of plants you'll be propagating. Personally I would go with #2 since the houseplants I'm interested in all prefer to be propagated using semi-hardwood cuttings. I suppose if you were to buy only one then #2 also makes sense because of its intermediate strength.

 

It depends on the plant species. I would go with #1 since it has the lowest concentration. If the IBA concentration is too high for the plant species, it will probably cause more harm than good. #2 has 3x the concentration and #3 has 8x of #1.

I have a list somewhere but I have to find it.

 

Thanks for your replies. I want to propagate a variety of plants, so I just wanted to buy the most general purpose one.

 

Could this possibly of use in fruit tree grafting? Or, perhaps it is stimulating the wrong growth.

 

Rooting hormones stimulate the production of roots. That would not be good at a graft point where you are wanting to join stem tissues.