I have two muscadine grapevines that I started from seed about 4 years ago. They are growing beautifully and last year made little flowers as they are doing now.. but last year they never made grapes. I thought that maybe the vine I had gotten the seed from was not self-fertile so I bought a Late Fry earlier this year to help, but it only has one cluster of flowers so I don't know if that will be enough to help out my older vines. It's hard to tell if what is on the vine is flowers or baby grapes. First time I have grown grapes. Any help would be appreciated. Thanks :) Paula
It does take a few years for Muscadines to mature enough to produce fruit. As long as they are growing and maintaining a healthy structure you should see fruit soon. Here is an article about caring for your Muscadine vine;
https://www.gardeningknowhow.com/edible/fruits/grapes/muscadine-grapevine-planting.htm
Should runners on muscadines without fruit be cut or pruned during the summer?
Other then removing dead material you should only prune during dormancy.
https://www.gardeningknowhow.com/edible/fruits/grapes/pruning-muscadine-grapes.htm
Our grape vine is SERIOUSLY overgrown. Can I cut at least part of it back this month? Thank you.
Grapes are ideally pruned every winter, because that way you will avoid removing leaves that are still actively providing energy for the plant. You can remove some of the overgrowth now, but keep this to a minimum and remove the rest of the overgrowth after the vine has lost all its leaves. Here's more about how to prune grapevines:
https://www.gardeningknowhow.com/edible/fruits/grapes/prune-grape-vine.htm
http://extension.oregonstate.edu/gardening/node/642
http://articles.extension.org/pages/31140/pruning-grape-vines:-an-overview
Is 1/8" cable wire sufficient for muscadine vines? Some sites recommend 9 gauge wire but I have access to an adequate amount of 1/8" Thank you Michael
That should, actually, be fine. There would be no harm in, at least, trying. If it doesn't hold than you will be back to the same point. Nothing lost. I would say go for it and see if it holds.
Here is a link to more information about Muscadines: https://www.gardeningknowhow.com/edible/fruits/grapes/muscadine-grapevine-planting.htm
Are they cross pollinators? Plants are 3-4 years old.
These will self pollinate, but multiple plants will give you a better crop. This article will help you with the care of these: https://www.gardeningknowhow.com/edible/fruits/grapes/muscadine-grapevine-planting.htm
My vine is wilting. I see no insects on leaves or vine. There are no spots or insect damage to leaves or vine. We've had plenty of rain. Any ideas?
Without photos, and the last statement of rainfall amount, I would guess that they have contracted a fungal infection.
Luckily, this will be easy to stave off. Use DOLOMITIC LIME and WETTABLE SULFUR together according to all instructions. Since you can't control the rainfall, this will be your best defense against infection to have these in the soil. I would apply this at least once or twice per year as a preventative, as well.
This article will give you more information on growing grapes: https://www.gardeningknowhow.com/edible/fruits/grapes/growing-grapevines.htm
My original Muscadine plants(three of them) were purple but someone gave me a green muscadine plant and now for the past two Harvests they are all green . I have at least two self-polinating plants and I want only purple Muscadines , is there anything I should do during the off-season ? thank you , Brent
Likely, they are not getting the proper balance of soil nutrition. Make sure to test the soil, often, and feed according to soil tests.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/edible/fruits/grapes/how-to-fertilize-grapes.htm
https://www.gardeningknowhow.com/edible/fruits/grapes/muscadine-grapevine-planting.htm
https://www.gardeningknowhow.com/edible/fruits/grapes/pruning-muscadine-grapes.htm