I have a white grape vine in my yard; it may a Thompson-type although it has seeds. I purchased the vine locally, but I have never seen a catalog or garden guide that says this type of grape can grow here in north Florida.

I planted the vine about 5 years ago and it had grapes these past two years. However, the grapes stay about the size of blueberries and they never really get sweet. I can let them stay on the vine almost until they are ready to ferment and they are still sour.

The vine buds out in March and blossoms before the end of April. But, because the rainy season here starts in June the plant produces as much leaf growth after the flowers have set fruit as it does before the flowers set fruit and growth continues for about a month after the grapes are gone. Leaf production has always been heavy.

I generally use Peter's liquid plant food along with bloodmeal, bonemeal and potash.

Does anyone have any idea as to how I can improve the size and quality of the grapes this vine produces?

In addition to what Terry posted, here's some more info on "How to increase the size of your seedless table grapes.

Grape Size

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Amor est vitae essentia.
Love is the essence of life.

I discovered that if I pinch off the bigger leaves on the vies it helps with the size of the grapes. I discovered this by accident when I was smokin some salmon. I used the grape leaves for under the fish and on top of the fish. Now I just go and pinch them off, just the biggest ones and not so many as to cause the plant to go bare.

Elfinone