I bought bare root strawberry plants from Home Depot this spring. They have grown almost 2 feet tall, and I doubt if they are strawberries. Same plants have sprung up from all the planters. TIA

Definitely not strawberries. Looks like some kind of weed to me.

My best guess:
Fatoua villosa; a weed that is often found in potting soil and purchased plants.

Edited to add link with photos for comparison:
http://www.discoverlife.org/mp...

Whatever it is, it grows in my pastures and nothing eats it.

A rose can be a weed #
A weed is anything dat grows where you dont want it !
Get it out of dars # Maybe ??? you can still save your berries. They have kind of a shamrock shape leaf with saw tooth edges.
😎😎😎 "the cool gardener"

Is there thorns on the stem? Looks like a berry plant! (Rubus) could be bramble (Blackberry) I'd say Rasperry (Rubus idaeus)

http://homeguides.sfgate.com/i...

These are blackberry brambles growing wild in my back garden.

Kaycd!
Greene is correct. That's a nasty weed called Fatoua villosa. It reseeds horribly so I would recommend pulling it up and putting it in the trash. I see lots of old flowers and seed heads on the plants in your photos.