The poetry day is a yearly event and in the year of 2014 and 2015 it was also a potree day (pun intended). This day is conducted by the society “Poesietag“.
To combine poesy and nature, so called poe-trees have been planed: These are plants that have been sold for the usual price and will therefore equal a tree in Algiers.
For the poetic note of the day, little poems are/were written onto fallen leaves that could be plucked by interested visitors. These represent the connection between nature and poetry, as the poems are (obviously) nature themed as well. The use of the plucked leaves is of course up to the folks that took them, whether it be decoration, gift or anything else.