This doesn't mention the one brassica that I hate more than any. Bastard cabbage. Like the other brassicas it is edible from flower/fruit to the root. Goes good in salads, etc. Unfortunately it is an invasive species here in Texas that quickly overwhelms native wildflowers. It appears along roads where work has been completed and rights-of-way reseeded using non-native grass mixes.

It is native to Africa and southern Europe I think but is invasive here in the US.

I first found some in my yard a couple of years after I bought a load of "topsoil" from a local materials provider. Not only was the product not a topsoil (it was river channel fine silt that is mostly clay-like particles with zero permeability and zero organic content) but the first thing to sprout on the pile of left-over soil was a tall plant with yellow flowers. There was a single plant that year. I had no idea what it was and asked one of my kids to ID it after it had already dried. Since it wasn't flowering stage when I asked they couldn't get a clear ID so i left it in place. That was a huge mistake. It produced uncounted quantities of small seeds that fell all around it and evidently birds loved it.

The second year saw it sprout up in a 10m radius around the original plant with isolated outliers. Again, I did not know what it was so I let it grow until summer (it is a late winter/early spring plant, one of the first to sprout) by which time it was obvious that this thing was gonna take over if I didn't do something. I sent a few more photos to my kid and this time I got the bad news - bastard cabbage.

With that info in hand I began implementing my eradication plan. I watered in all the plants that I could locate. It was summer and the ground is very dry and soil is hard here at home. With the soil nice and wet I pulled or dug every one of those bastards that I could find knowing that I would be doing the same thing again next year.

So far it has been several years of walking the property, pulling these bastard cabbages as I find them. So far this year I have less than a dozen plants but the season is young. I have found about half of those plants growing where previously I had never seen any and the others were growing in the original affected area.

Just like my years-long battle against St Augustine grass, stickers, goatheads, and Johnson grass I will win. I have eradicated those plants from my property though it took more than a decade to completely eliminate the Johnson grass.

Once I can identify the plant at each growth stage its days are numbered, sometimes with three or four digits, but I will win in the end.