I have recently (last fall) picked up a few varieties of grape (Suffolk, Niagra, Catawba, Marquis White) that I wanted to try out in our yard. Due to the potential for an upcoming move in the next few years, the grapes and all of my other fruit trees are being grown in containers/pots (5 gallon to 25 gallon). Most of the fruiting trees are no big issue and get pruned appropriately for the tree or bush.
Then I come to my grapes which are currently in 15 gallon Nursery pots.
Initially I was planning on doing a in pot trellis approximately 5ft tall with 2 - 8ft cross rails for a Kniffen 4 arm style of training/pruning. Unfortunately, after only 1 year my 2 oldest grapes have gotten large enough (combined with mistakenly using wood stakes as the verticals which are rotting after 1 year) to make the trellis unstable. And I can see how this will end up being insufficient as the vines get bigger. Since I have to replace the vertical stakes of the trellis I am wondering if there is a better way to train/prune the vines that would work better in a Container/pot growing scenario.
I do like the way the Kniffen system allows for a decent spread and airflow for the vines but was wondering if a Head Training/pruning method might be better for my scenario.
I am also considering making new stands (24x24 pallet style base/stand out of composite decking so they dont rot) that the pots will sit on that could have a more substantial trellis built in but want to make a decision on training the vines prior to building anything.
I also dealt with my 2 newest vines getting hit with black rot this year. I cut all the infected parts off, bagged them for trash, copper sprayed and seems to have caught it before anything bad happened. I did loose all of the grow from spring thru beginning of August but they are both throwing out new grow now that does not seem to be affected by the Black rot.
Any suggestions or recommendations on which way might work better in this scenario?
Thank you.