Need help with Grapevines

Im posting an older pic and a newer pic. One of my grapevines is already outgrowing my trellis....I am not planning on building an arbor or adding on to my trellis. So i am seeking some advice. Do i cut the vines as they outgrow my trellis? Do i let it flop over and start growing downwards? Interested in some feedback. At least for this year there will be no more construction...

https://permies.com/t/142947/apple-trees/growies/Grapes

Here's a thread that might help.

I have three sets of grapevines (green, purple, red) each with a trellis setup like in the picture. Each Trellis has two grapevines. I am doing this mostly for fun, anything that grows is a bonus. Should I 1) remove one vine from each trellis and "center" the other vine? These trellises are about 6 feet wide can i get by with that? i would prefer not to add on sideways if possible. A Question about an Arbor...they say it allows more sunlight to the vine, but if the top is covered wont that limit the amount of sun that gets to the plant coming up from the ground? Ideas, suggestions?

I'd stick with the two plants of each type that you have.  That way if one dies you'll still have one of each kind.

For the trellis extension, can you cobble something together that hoops over to the chain link fence?  Then you could have a bit of a tunnel and they could crawl along the fence as far as they want.

As for sun, it looks like they're facing south already (which is good).  As they get taller or go onto an arched extension, the sun will still hit their lower leaves.  Much like your ankles still get a sunburn when you're naked and wearing a cowboy hat.  If they want more sun, they'll put more leaves where the sun hits.  If it's up high, they'll put more new leaves up high.  As vines they are very good at chasing the light.

I always heard that chain link fences weren't good for grapevines. Someone recently said something about something in the metal. You really think its a good idea to keep both plants per trellis? Im not worried about losing a plant or having to replace it, im trying to find out what the best spacing is. Thanks for the help

Hmm, I haven't heard that before but I'm not often in discussions about it.  There is a very healthy grape vine in my town on a chain link fence.  So healthy that you can barely see the fence under it.

If you were going to keep it to just the trellis you have there, I'd probably cull one or they'll always be trying to outgrow it.  No need to center it though.

Thats what i was thinking, go with one, but even one is clearly going to keep outgrowing it. I figured center it, but i guess it isnt needed. I have alot to consider. Thanks for the help

I'd go for letting them trellis on the fence also.

Depending on if you decide to expand the trellis next year, this year you could tie a string from the top of the existing trellis, a string for each vine, tied to the fence behind it, and let them grow along the fence this year if they get that big.

That way, if you decide to expand the trellis next year, you will have a bigger vine ready to produce more grapes, and can just move the vines from the fence to the trellis.

Or better yet, you could plant a fruit tree on each side and let them grow up into the fruit trees as a natural trellis. I've built a lot of grape trellises, which can be expensive and a lot of work. Natural trellises have been much more affordable, much less work, and you get another fruit harvest as well!

Hope the grapes turn out well!

Im considering letting them onto the chain link fence..Thank you