Eric Schrader
Chumono
I previously only did Kishu cuttings in October/Nov but Ed Clark told me to try it in June. He said keep them as hot and wet as you can until they root.No, I've used solar heat in summer and no heat in winter. But I'll give it a go. Weird thing is that everything but chinese junipers strike easily.
I'm even going as far as ziplock bags in the dark to see what comes out of it.
Thus far, a huge caterpillar that ate a bunch of foliage and some white fungus.
Which brings us back to timing and application; bottom heat, summer and winter? Only in winter? Day and night?
As for the heat mat - yeah 24/7 at about 75F - maybe hotter even will really drive root growth. In your location I'd try June, but if you have the stock to try it, now is not a bad time either. But I think me not having to deal with real winter weather is in that fall cutting formula...