If something is sapremic, it is related to or caused by decaying organic matter.
The word sapremic can make people think of rot, decay, and bad smells.
Examples:
The sapremic smell came from the old food.
The sapremic material in the compost helps the plants grow.
The sapremic waste attracted flies and bugs.
The sapremic pile of leaves made the whole yard smell bad.
The sapremic swamp was full of gross things.
The sapremic soil was perfect for growing mushrooms.