Planting Grape Vines - Sour Grapes?

by mr robert howes


I have two grape vines one black and one green, 5 years
old facing south in heavy clay soil.I have fruit on the
two vines which i have left on, but the fruit is small
and sour how can i improve the fruit for next season.

Hi Robert,

the quality of the fruit depends on several factors.
First is the variety or type of grape vine that you chose. Some varieties just don't have sweet flavor and if that is the case there is not much you can do about it. Do you still know the name of the varieties?
The other reason for sour grapes could be that the plant simply set too much fruit. The grape vine plant produces the sugar through the photosynthesis process. If there is too much fruit the plant won't be able to produce enough sugar and the grapes reamain sour.
Thinning out the fruit will solve this problem. Just remove about half to a third of the fruits.
Sometimes removing some foliage that shades the grapes can also help.

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Feb 12, 2018
sour grapes
by: christine

we have just moved into this house so we have got this grape vine don't know the name of it has got alot of fruit but very sour [this is the black grape] would pruning it back after fruiting will this do a turnaround to the taste if not what can be done with the fruit if not eaten

Sep 27, 2016
Sour Grapes
by: Joseph Q

I had a vine that fruited this year. I'm wondering why the fruit has the consistency of a muscadine than a table grape.

I say muscadine consistency because the skin is a little tough. The flesh between the skin and pit is almost non-existent but they are sweet. The pit/center that encloses the seeds is really really sour and slightly chewy.

Is this normal for first time fruiting?

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