What’s That Ferny Weed?
![Poison-hemlock spring foliage [Conium maculatum]. Wynn Road shoulder, Bellingham, WA. © Mark Turner [2000555] Poison-hemlock spring foliage](/wp-content/uploads/2020/04/Turner_2000555.jpg)
A couple of weeds with “ferny” foliage are coming up in our neighborhood now and it’s important to know the difference. Poison-hemlock, Conium maculatum, as the name suggests is poisonous. That’s the plant pictured above. ALL parts of this plant are toxic to humans and animals, particularly if eaten. Don’t touch this plant and then get your hands near your face. Wear gloves and other protective gear to dig, pull, or otherwise remove it. The King County Noxious Weeds website has further information about poison-hemlock.
Positively identifying this plant isn’t as easy as one might wish. The best diagnostic when the plants are small is to look for purple spots on the stem and the leaf petioles. The spots were just barely visible on the plants I photographed up the road from our house, but I know from observing the site over the years that there’s a big patch of this nasty stuff growing there. The purple spots on the stem persist throughout the growing season so that’s your best clue later in the season, too. Continue reading