The stench outside the music room

So, my classroom at school is in a portable, and the kids have to walk outside to get to it. Next to the portable is a lovely butterfly garden with flowers and other plants. Today at about 11 am, I opened the door to wait for my 3rd grade class to come, and I smelled a stench coming from just outside the portable. The third graders came up to the door holding their noses and yelling “What’s that smell?!” Then their teacher said, “Oh, no. I know what it is.” Apparently for a science project, the class made compost, and their teacher decided to leave it in the butterfly garden to help the plants grow. Um…thanks.