It may need one more year to fruit, as it had to start over from the stump the previous year. The problem could also be related to growing in a container if the roots are getting too hot. However, it may also be suffering from Pierce's Disease (PD), which is a potential problem in central Texas. The crispy brown leaf tips could be an indication of PD. Unfortunately, there is nothing you can do except grow PD resistant varieties, and the vast majority of varieties (including Muscat) are not resistant to PD.

Here is a link that might be useful: Pierce's Disease

Kiwinut,
Thanks for the information re: Pierce's Disease. I guess that means I should not try to grow new vines from the trimmed shoots after pruning. Right?

If the cuttings are infected, they will likely die very quickly, as small plants are very susceptible, as the bacteria can completely colonize the tissues in a short time. If the cuttings do ok, then your vine is probably not infected.

I've read that grapes need a little bit of bone meal dug into the soil every year. One of my grape vines produced grapes the first year I planted it, a green variety. My black vine didn't produce anything until the third year. This year, it was do darned hot for so long, neither vine put out any grapes.

Kayakita, my guess is you have Pierce's disease and your vine is a goner. Type Pierces disease into the Google image search box and see if the pictures that pop up look like your leaves.

Scott

I'd try :

1) plant it in the ground
2) seems you are OVER fertilizing it..don't add anymore
3) might be OVER watering it....water once a week
4) allow more buds to push in the spring....prune to 4 canes of 15 buds each...

It seems your plant is in a vegatative state only, need to allow it to push many buds, and then it will produce clusters....GOOD LUCK !!

Thanks Ezawanda, Scott, Lorna, and Kiwinut for all your helpful suggestions. I'll try all (or at least some of them) and see what happens. I've thought about planting it in the ground and I think I'll try that while it's in a dormant state. Next year, when I prune will save some shoots and plant them. Checked the photos for Pierce's
disease...somehow my grape leaves don't look quite as bad.
Can grape vines contract Anthracnose? I had the container next to a Cottonwood sapling that appeared to have that problem. Have since moved it to another location.

More questions...this time about vineyard terminology:
Are the large branches growing out of the old short stump called "arms"?
Are the thinner branches growing from the thicker branches called "canes"?
Would it be advisable to remove one of the thick branches completely and just leave two to train along the fence?
Should I prune the tops of the thick branches to 5 or 6 ft? One is almost 8 ft. long and was reaching up into the tree tops. It looks like very old wood.

I have three green muscat grapevines planted against my fence, they have full sun exposure at least six hours a day and produce a lot of grapes that never fully mature and then wither and turn black, I sprayed them with some copper and lime but it does not seem to help. They're about 8 years old.

Is it possible that I water them too much?

Any help, insight, comments, or questions would be greatly appreciated.

TIA, Costel.