I am one crazy gardener.
If I could design it:
no flowers just plants
in different shades of green.
Now all of you think I am crazy
My oh my crazy me.

I assure you it will be nice
but on the second floor it is
not possible.
I will throw some names at you,
through the lovely sky
is fastest.

Asparagus Fern
Bamboo
Weeping Willow
Aucuba
Canary Ivy
Fatsia japonica
Rubber Plant
Peach Tree
Apple Tree

Interested what they
look like,
search the net.