Any Reason to NOT Use the Strongest Concentration Rooting Powder?

westes Zone 9a California SF Bay
last month
last modified: last month

Rooting powder comes in different concentrations. Hormex makes a #1, #3, #8, and #16, with #16 being the highest concentration around 1.6%. Some online propagators of hard-to-root plants like Protea say that Hormex #16 is the only concentration that they have seen work. This got me to thinking. Is there ever a reason with any plant to not use the highest concentration hormone you can find? They cost about the same amount, so why not just always use the highest concentration?

Comments (3)

  • Vladimir (Zone 6a Massachusetts)
    last month

    I have read on the Internet that too high a concentration may actually inhibit root formation. I have not had the personal experience to corroborate that.

    westes Zone 9a California SF Bay thanked Vladimir (Zone 6a Massachusetts)
  • westes Zone 9a California SF Bay
    Original Author
    last month

    @vladimir If you run across one of those articles, please link it here. Maybe it is species-specific?

  • Carol love_the_yard (Zone 9A Jacksonville, FL)
    last month

    I've had the same question. Following.