If you want consistent production over the long term, they should be replaced every 7 to 10 years.
reptile and fish people pay big money for grapevine wood lol. was just at a reptile expo and people were selling small pieces of it for like 15 bucks and big ones for 30-50. since weâre discussing pruning lol
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If you google âHow many feet of cordon wood should each muscadine vine have?â you will get back â20 feet of total cordon (fruiting wood)â.
But this is for a single wire trellis. Iâm using a double wire trellis so I double it and get double the amount of muscadines!
Or so I hope. 
Actually I think the biggest advantage is that I get better sunshine on my vine with the double wire.
In the article that I have linked the author suggest to renew the arms by âperiodically ârenewâ the cordon by thinning out old bearers, and allowing new spurs to develop from shoots that grow from latent buds in the cordonâ - (Figure 15). As I take it the bearer is the length of the spur from the arm as it has grown out.
Originally I had thought that to ârenewâ an arm (cordon) one had to simply select a vigorous cane near the trunk and have it as a new arm and then just cutting off the remaining much older arm (cordon).
What do you think?
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Iâve used both. But over time an older cordon tends to produce less. You have to be careful with replacing the old but it can be done by growing a new cane one year and then pruning the old the next year.
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Either way will work. I prefer to thin the spurs. I have 1 side cordon that doesnât look healthy and after this season I might regrow it.
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Is it possible that you could completely do away with the cordon that doesnât look healthy and regrow a cane from the opposite cordon to take the place of the unhealthy cordon?
I would think that the 7-10 years estimate on the issue of replacing a cordon is based on the number of years that that particular cordon has been fully productive rather then how many years that the vine has been in the ground.
So that when I say that my vine has been in the ground for 9 years is what Iâm really saying is that my cordon is really in its 6th year. Is that not true?
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Got my order from Gurneys⌠planted Oh Yes and Razzmatazz today.
TNHunter
Yes you could do that.