18,000 Facebook shares can't be wrong! The Healthy Hybrid writes:

Various plants (in no particular order) that you can regrow from the food you already have! Woot! Way to reuse and recycle! I constantly have green onions and celery growing. (And potatoes/sweet potatoes but that just because they decided to do that in my pantry.

Apples https://www.ehow.com/how_2135774_grow-apple-seeds.html

Tomatoes https://www.ehow.com/how_5581958_grow-tomatoes-fresh-tomato-seeds.html

Potatoes/Sweet Potatoes https://www.gardenguides.com/117543-plant-cuttings-potatoes.html

Green Onions https://www.17apart.com/2012/02/how-to-grow-green-onions-indefinitely.html and https://tipnut.com/nifty-food-plants/

Leeks same technique as green onions

Carrot Tops https://www.gardeningknowhow.com/children-in-the-garden/grow-carrot-tops.htm

Pineapple https://www.rickswoodshopcreations.com/Pineapple/pineapple.htm

Romaine Lettuce Same technique as celery

Cabbage Same technique as celery

Celery https://www.17apart.com/2012/02/growing-celery-indoors-never-buy-celery.html

Avocado https://www.thehungrymouse.com/2009/09/09/how-to-grow-an-avocado-tree-from-an-avocado-pit/

Lentils https://foodstoragemadeeasy.net/2009/02/19/how-to-grow-sprouts/

Pumpkin https://pinterest.com/pin/98375573080950437/

Ginger https://www.gardenswag.com/2011/12/5-foods-you-can-grow-from-kitchen-scraps/

Garlic https://www.gardenswag.com/2011/12/5-foods-you-can-grow-from-kitchen-scraps/

Bonus: Bok Choy https://www.17apart.com/2012/02/how-to-regrowing-bok-choy.html

Ok, so actually that's 16 foods you can regrow from scraps.

Awesome.

just don't give the carrot tops any steroids...

I once tried to do this with an avocado and it was a HORRIBLE FAILURE. :(

Something else you might enjoy: Which health supplements are a waste of money ...