What is the grass growing on?
The grass is growing on the ground.
    src        edge_attr  dst
0     4     hanging from    5
1     4  to the right of   11
2     4  to the right of    8
3     5  to the right of   11
4     5  to the right of    8
5     7       growing on    9
6     8   to the left of    5
7     8   to the left of    4
8    10   to the left of   11
9    11   to the left of    4
10   11  to the right of   10
11   11   to the left of    5