Your garden refrigerator bed comes with a built-in composting compartment that is completely pest-proof and helps expedite the composting process by maintaining moisture and heat.
It takes about 6 to 9 months for the compost and food scraps to break down. You will need to turn and mix this compost about once a month, rotating the broken down parts from the bottom to the top. If your compost appears dry, add some water, if your compost is soupy and has too much water, you'll want to add grass clippings or other dry leafy materials to help soak it up.
The best way to feed your composter is with quality compost, like banana peels, coffee grounds, eggshells, and any leaves or plant bits from your garden that you can't use. Do not compost things like meat, cheese, dairy products, onions, garlic, or most weeds from your yard, but other plants like cut grass can be great additions to your composting compartment
This is the EPA's full list of compostable and non-compostable things. If you are ever unsure if something is compostable, look it up.
You may find that some of your compost is ready while there are still large bits like mango pits, avocado pits, or things that are slow to break down. You can use a simple large wire sieve to shake the usable compost into a box and hold the large food waste that has not broken down behind so you can return it to the composter. Once you have nice quality dark brown compost you'll want to add it to your garden by digging a small hole or using a hole left behind from a recently harvested plant. Gently bury the compost. You should do this one to two times a year, if you don't have enough compost, you'll want to consider fertilizing to support your plants' nutrient needs.