Grapeman, Just read through the entire thread. Awesome info / posting. Thanks....Hope the future finds/keeps you well.
I too am propagating my own vines in preparation for a vineyard. Last year we obtained 17+ acres vacant farmland in The Mohawk Valley Region of NY. 5-6 acres will be 1/2 vineyard 1/2 berry crop. All for making wine. Long range retirement plan of operating a Farm Winery. In 2-3 years I should have propagated all the berry plants I will need. 4-5 should show sufficient grape vine numbers.
I have been experimenting using a different (very easy) technique that might be helpful to members depending on their space & time. It involves a little less maintenance work. Initially there is some prep work as a propagation bed must be made. One drawback is it delays a viable/healthy/transplant-able vine by a year. The plus side is the vine generates itself in the climate it will be living its life in.
POST spring pruning (BEFORE BUD SWELL) of the "parent" vines my trimmings are (re)frozen precut to the desired length and packed in moist media such as shredded newspaper. I maintain the 3-4 budd rule as I place 2 buds under ground when I plant. They remain frozen until the ground temperature reaches 75 deg. and will maintain that temp overnight.
As has been highlighted callousing is a key to a healthy vine start. Once the soil temp is right they are removed from the freezer & / placed in a warm spot & the callous will begin to form. I keep the "sticks" in the media so they do not dry out and allow the buds to begin to swell.
Planting time...I then Dip in Rooting hormone and stick in holes 2 budds deep in my propagation bed.
I had about 75-80% survival rate over the summer on several varieties with 1-2 feet vine growth. Catawba / Cayuga / St Croix / Traminette. All just sticks planted in the ground. Other varieties as well but not sure if they will work out. I will post overwintering survival rates once spring wakes my babies up.
Also experimenting as to which type of propagation bed has better winter survival rates. One bed is a well prepared garden soil plot. 2nd bed is a raised bed 1/2 sand / 1/2 garden soil mix which showed excellent root development when samples were dug and also allows for earlier "stick planting".
Kinda got long winded I guess. Hope this helps some folks out.