Make sure that your grass clippings are fresh because dried grass clippings will add carbon to the compost. [2] X Research source

Do not add badly diseased or insect-infested trimmings, or weeds that contain seeds to your compost unless your compost is hot enough to destroy them.

In a 5x5 foot (1. 52 x 1. 52 m) bin of compost you’d add 1/3 to 1/2 cup (113 - 170 g) of fertilizer to the compost.

Use the leftover coffee grounds from after you brew coffee. If mold grows on your coffee grounds you can still use them because it will be broken down during the composting process, or help in the process.

Without heat, the compost will take anywhere from 6 -12 months to fully break down.