Compost Scraps are used at a Composter to produce Bags of Compost. In order to make one Bag of Compost, you need 5 pieces of Compost Scraps.
Mimics Who DropEdit
All mimics have a chance of dropping this item, but the following have the highest chance:
You will need 5 Compost Scraps to turn into 1 Bag of Compost to give to Hawthorn for the sidequest Compost Craft (HT0001).
You will need 25 Compost Scraps or 5 Bags of Compost for the sidequest Radish Garden (LD0002).
You will need 40 Compost Scraps or 8 Bags of Compost for the sidequest Haze Fever (CMG0001).
You will need 25 Compost Scraps or 5 Bags of Compost for the sidequest Cotton Harvest (LW0004).
You will need 15 Compost Scraps or 3 Bags of Compost for the sidequest Third Time's the Charm (MX0003).