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 http://www.ehow.com/how_2135774_grow-apple-seeds.html

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

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

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

Leeks same technique as green onions

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

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

Romaine Lettuce Same technique as celery

Cabbage Same technique as celery

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

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

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

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

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

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

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

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

Awesome.

Which produce is in season: http://pandawhale.com/post/5958/which-produce-in-season

There's always something in season!

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

Ha. In general don't give your plants any steroids.

Other links you might like:

Orange Candle http://pandawhale.com/convo/4416/orange-candle

Grow a Pumpkin IN the Pumpkin http://pandawhale.com/convo/7661/grow-pumpkin-seeds-inside-a-pumpkin

Grow Carrots in a Planter http://pandawhale.com/convo/5504/how-to-grow-carrots-in-a-planter

Square Foot Gardening http://pandawhale.com/convo/5506/square-foot-gardening

Ten Lifehacks in 2 Minutes http://pandawhale.com/convo/5781/10-lifehacks-in-2-minutes

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

Why does this not work with apple pie? Anyway, that's probably a good thing. These are all healthy foods. And people usually buy healthier food for their dogs than for themselves. Our minds often play tricks on us when it comes to food.

The economics of potatoes makes them suitable for a first try:

http://pandawhale.com/post/68145/my-34682-roi-on-potatoes

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

Another good read: A simple fix for farming...

This is my pineapple plant, it's between 2 and 3 years old and now has my baby pineapple!

Deirdre, that's awesome! Looks like that pineapple is coming in nicely.

Thanks Adam!! It's a little bigger now but hasn't come up and out of the plant just yet. The pineapple I took this top off of was delicious too!!!

That sounds excellent. I'm going to have to try that myself someday.

Fresh pineapple does sound very appealing!

I have also used the root end from a white onion and put it in dirt and it grows green onions 

Thanks for the tip, Brenda! I will have to try my hand at white onion growing...

Lately I've been looking into vertical gardening, too:

Here's what I've learned so far:

http://pandawhale.com/post/16325/vertical-gardening-the-ultimate-herb-and-spice-rack

have you seen these? Uses no soil: www.TheTowerGardenLife.com

Thanks Brent, will check it out.

8 vegetables that you can regrow again and again:

http://pandawhale.com/post/40951/8-vegetables-that-you-can-regrow-again-and-again

Now available as an infographic:

http://pandawhale.com/post/53119/food-that-magically-regrows-itself-infographic