Rooting Hormone - Liquid vs. Powder

I have recently been introduced to a liquid rooting hormone called KLM 
distributed by DynaGro and, of course, I believe we are all getting familiar 
with Superthrive.  Does anyone know if these liquid hormones have any 
advantage to the powdered.  I have both and have used both.....I have also 
used none--In my experience, thus far, I haven't noticed that the hormone is 
actually helping me.  I usually root most everything is 50/50 vermiculite and 
perlite--sometimes adding alittle peat or Jungle Gro.  I've been having about 
90% of my cuttings root and I haven't used a hormone at all.  Is the hormone 
more important for the "hard to root" cuttings?

Just wanting to find out some of  your experiences as I am getting ready to 
take some of my summer cuttings, ie. clerodendrums.  

Thanks

Kemberly McLain
Katy, Texas  Zone 9

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