I have used jiffy pots and clonex for years with no problem. Recently my last two groups of cuttings would not root. Generally they root in 9-12 days at most. I have not changed the procedure in any way. Anything come to mind anyone?-bd
Different strain? Some strains are a real bugger to get to root.
have you tried scarifying the stem a little? Scrape lightly the out layer with a razor exposing the cambium layer? Roots will grow from this layer better.
If nothing has changed in your setup, process, temperature, etc. then I would get a new batch of rooting solution. Do you heat under your cloning tray? That may help also.