Flores sub rosa fossa was the very first flower arrangement I made for outdoors. The flowers were designed to commemorate the gunpowder explosion in 1807 in Leiden killing 151 residents. This flower arrangement was part of the exhibition Beelden in Leiden (BIL) and was supposed to last outside for only two months, but it traveled to many outdoor and indoor exhibitions and events since. In the summer of 2016 the flowers could be found in one of the oldest graveyards in the Netherlands in Hengelo, and that took its toll. Flores sub rosa fossa was dismantled in the fall of 2016.