You didn't mention what kind of grapes you are growing. I would not recommend vinifera as they get a lot of diseases. A high single cordon is the simplest and best east coast grape growing method since the hybrid grapes you want to grow tend to grow down and the guyot is meant for vinifera grapes which want to more grow up. Also a higher trellis will get better air circulation and fewer diseases again.

As long as the circulation is good, your 15x25 space sounds fine.

The height of the grapes should not cause a problem for the other plants, they never get too high since they get pruned back to the trellis every winter.

I would recommend getting Lon Rombough's grape growing book, it covers all the basics of grape growing.

Scott

I have not decided yet on the types of grapes to grow. It seems most of the folks recommend 8' room for each grape.

I did buy my first grape vine from a local nursery. It is a Marquis from Holybrook.

It is very late to get any grape vines from local stores. I'm not sure if it is too hot to get bare-root shipped in early summer. Or I'll wait until late fall to order.

I'm open to the types of grapes to grow. I'm thinking of getting total of 6 grapevines.....

You could get potted grapes now, Edible Landscaping for example sells them. Its too late for bare root, if it heats up they will fry. There are many variety lists and posts here about grape varieties so I would read up on them. If you search this forum with the variety name you will get folks past opinions here on how they like that variety. You don't have room for 6, 25' at say 6' spacing is 4 vines. In theory two rows can be put in 15' but for home growers who want to avoid disease I think that is too close. I used 8' inter-row row spacing and regretted it and relocated things. Between vines 6' is fine if you want to try more varieties. Just don't let them run into each other.

Scott

I was thinking about 2 rows of 3 plants each row. So you think that is too close to have two rows within 15'?