Identify this vegetable?

[exff22]

My plant app says it's cabbage but I don't think it is because I never planted any there and it's already two feet tall. I have some Brussel sprouts growing in another bed and this looks a lot like those, but I don't remember planting any in that spot either. My garden bed is less than a year old and the last thing I had growing in this spot

were sunflowers over the summer.

 

[YumYum]

That is a Brassica of some sort. It is trying to ball up like a cabbage plant would so my first guess would also be cabbage. Hard to believe it is wild cabbage unless there is a cabbage farm nearby since a cabbage plant would have to bolt and flower and then set seed and then a bird or something else would have to fly the seed to your place and drop it off. Birds do love sunflowers so one could have pooped a seed out there.

I've tried to grow brussel sprouts here but it gets too warm too quick and they dont produce so I quit. I can't really remember them looking like that though.

It doesn't look 2 feet tall. What is that slightly darker green looking plant leaf in the top of the picture? That also looks like a Brassica leaf.

 

[Oliver Buckle]

Not a sunflower , brassica of some sort, and like you say could well be a Brussel sprout. It is very easy to get one of those little black seeds stuck to something and dropped elsewhere.
Sorry, wrote this last night , but didn't hit reply, so didn't see yumYum's reply until this morning when I posted, seeds are designed to get themselves moved around, by us, birds, animals, whatever. Let it mature and see what it turns into, or eat it now if it's in the way, it will make quite good greens.

 

[exff22]

That is a Brassica of some sort. It is trying to ball up like a cabbage plant would so my first guess would also be cabbage. Hard to believe it is wild cabbage unless there is a cabbage farm nearby since a cabbage plant would have to bolt and flower and then set seed and then a bird or something else would have to fly the seed to your place and drop it off. Birds do love sunflowers so one could have pooped a seed out there.

I've tried to grow brussel sprouts here but it gets too warm too quick and they dont produce so I quit. I can't really remember them looking like that though.

It doesn't look 2 feet tall. What is that slightly darker green looking plant leaf in the top of the picture? That also looks like a Brassica leaf.

There's actually three plants growing. All the same.

 

[loz]

Trying to be a grower but am more technical, reverse search says its a collard, or a non heading cabbage. Great for slow cooking recipes and similar to kale. Will you try it?