A google search says they are bush-type beans:

Black Turtle Bean
Origin: Central America
Item #: BUSHBEAN004
The Black Turtle Bean, also known as Black Beans, Turtle Beans, Black Spanish Beans, Tampico Beans, and Venezuelan Beans are becoming more and more popular every year, in part due to immigration from Latin American countries where the Black Turtle Bean is so widely used in soups, stews, sauces, for sprouts and much more. Black Turtle Beans are used dried, which was originally due to the fact they could be stored for up to a year and provided a good source of protein in the winter months back in the old days. As Black Turtle Beans are originally native to South America (and were introduced to the United States in the late 1700's), they require a long, warm season to perform well.

The plant of the Black Turtle Bean is a hardy bush-type plant that is very disease resistant and handles drought and heat very well.

The beans themselves are small (about the size of the common Garden Pea), of an oval shape and have a very beautiful, jet-black coloration with a cream colored interior with a sweet., earthy taste.

Mature in 90 to 120 days.

Apparently the plant is between 18-24" tall.

PV

Thanks PV, You dont know how many websites I looked at and couldnt nail it down. (little embarrassing!)

Now I know I can grow them inside the fence but dont have to do it right up against it!