Container gardeners don’t need to worry as much about weeds and pests, but if you’re growing your food in the ground sometimes things pop up in the old garden that are not so welcome. That’s not always bad, right? Sometimes you get delicious volunteers from the compost bin. If the uninvited garden guests are weeds, you just pull them out and move on. But there’s one weed that pops up in food gardens that’s a little bit tricky and can be dangerous: poison hemlock.