What are the plants on?
The plants are on the wall.
    src        edge_attr  dst
0     1  to the right of   12
1     4   to the left of    9
2     4   to the left of    5
3     4  to the right of   20
4     5  to the right of   20
5     5  to the right of    4
6     5   to the left of    9
7     7      in front of   15
8     7             near   20
9     8               on    6
10    9  to the right of   20
11    9  to the right of    4
12    9  to the right of    5
13   12   to the left of    1
14   13   to the left of   20
15   15  to the right of   20
16   15           behind    7
17   19          wearing   12
18   19          holding   18
19   19          wearing   14
20   19   to the left of   20
21   19          wearing   10
22   19          wearing   21
23   20   to the left of    9
24   20   to the left of    5
25   20   to the left of    4
26   20  to the right of   19
27   20  to the right of   13
28   20   to the left of   15
29   20          next to    7