Our garden was taken over by triffids last year. They were huge, looked kind of like celery but their stalks were not tasty. Then they shot seed all over. Because I'm in Los Angeles during harvest time, it comes down to my overworked wife and eager child to deal with the garden.
Which is why I didn't discover that the triffids were parsnips until the edible parts had turned to oak.
We got some damn parsnips this year, I tell you what. I be pullin' those things when they're edible.