I recently requested germplasm of some rare native raspberry brushes from the USDA grin database. They send them bare without roots and I assume in a dormant state as I couldn't even request them until Sept 1.
I have two books on woody plant propagation since I can't afford these cuttings to fail. I'm starting a raspberry breeding project.
I think I'll go with half peat, half perlite, and keep them in sealed bags to keep in moisture. The heated mat and cool tips sounds good, but do I keep them indoors or outdoors the whole winter? In dark or sunlight?
Location: Cache Valley, zone 4b, Irrigated, 9" rain in badlands.
posted 2 weeks ago
My general strategy for rooting cuttings is to root them in pure coarse sand. I suppose that if it were me, that I'd dig a hole outside, fill it with sand, stick the cuttings into it, and make sure that they stay damp until they root and sprout. Perhaps, I'd fill a pot with sand, and bury that in the ground outside. Raspberries thrive in partial shade, so I'd try to mimic that in my planting.