I have a patio that has and 8ft side then a 90 degree turn and a 14 ft
side, is this enough space to grow grapes?

14 ft
------------+
| 8 ft
|

should I planr by the corner post? leaving a 14 ft run 1 way and an 8
ft run the other? or is better to plant by the end of the 8 ft run,
which buts up against the house? How many vines can this support?