I planted some broccoli and I thought I was transplanting all broccoli, however, this plant started growing. Of course my other 9 plants are broccoli. I am in Houston, Texas and any mulch in my garden is from this area. The bottom part has a thick stalk like Kale. It tastes like grass. I don't notice any large bulb for the root.
I wonder if it is one of the mustards with edible leaves?
Many of these plants can cross pollinate each other, and many are weeds that grow in the wild, and many of the seeds look similar enough that the seed sorter cannot tell.
Sure looks like a Brassica.
You say it tastes like grass, so mild flavor (at least when young), but maybe not appealing.
Lets see the flowers! But not if you intend saving the seeds from your broccoli. I would not want them to cross.
Are there wild Brassicas in your area? We have a bright yellow flowered mustard, a paler yellow and several purple and white flowered types that I think are a bit more like radish (but not that big root). Your seedling looks like one that grows around here with light purple and white flowers.
Also in that plant family are:
Brussels Sprout (leaves a lot like Broccoli)
Cauliflower (leaves a lot like Broccoli)
Flowering Cabbage (Yours is not this- very distinctive leaves)
several items lumped together as Asian Greens
other, less often grown things.
Quite a few garden flowers, too. Not sure if any look like your seedling, though, and probably not close enough related to cross with each other or the vegetables.
Yes, I have tasted it. It would be a mild Mustard Greens. I was hoping to know the variety if it was. That is what I first thought it was, but when I looked at the ones in the stores, I didn't see my kind. This must have gotten mixed up in some Broccoli seeds I bought.