The Weed Detective

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The Weed Detective
Nancy Reynolds, Delaware County Master Gardener

Pokeweed (Phytolacca americana) July 2021

Tall with lovely purplish-red stems, large showy leaves and grape-cluster-like deep purple berries appearing after a pretty spray of white flowers. It can grow 6 – 10 feet tall and support small birds. What’s not to love? Pulling it out by the wheelbarrow full! That’s what!

This month’s weed is Pokeweed, also known as Pokeberry, (Phytolacca americana) is a perennial native plant that grows…well, almost anywhere! The plant is hazardous to livestock and all parts of the plant are considered toxic. The berries are particularly poisonous to humans so if you have pokeweed and small children that play in the area, be sure to keep the 2 apart! Some people consider pokeweed edible and eat poke salad in the spring after boiling the leaves, but I definitely don’t recommend it; the risk is too high.

Eradicating pokeweed is as easy as pulling it out, provided the soil is soft. For an older perennial plant with a larger root, digging may be required. The stems of pokeweed are hollow so control may be gained by cutting off the plant and pouring vinegar, salt, baking soda or weed killer into the hollow stem. As a temporary measure to reduce the spread, simply cut the flowers off before it goes to seed. Birds love the seeds and spread them liberally. Seed is viable in the soil for 40 years so this is another reason to cut off the blossoms before the seeds are produced. Wear old clothes and gardening gloves when handling pokeweed; some people are sensitive to toxins in the foliage. And, if the berries are present, you will end up with purple hands and purple-polka dotted clothing.

Carpetweed (Mollugo verticillate) June 2021

About 15 years ago, when I was first doing my deep-dive study of weeds, I went to a program where I was introduced to this very pretty and unusual weed called carpetweed. I was very intrigued and decided to bring home a plant to study it more closely. After analyzing the leaf structure, stems and roots, I tossed it into my compost pile. I have spent the last 15 years pulling it out of my beds. My neighbors give me the stink eye every time they are working in their yards as, they too, have spent the last 15 years pulling it. Sigh!

Carpetweed, Mollugo verticillate, is a prostrate annual that forms dense circular mats of foliage. In other words, it forms a thick, low-growing carpet. And, it grows FAST! It initially intrigued me because it is one of very few weeds with a “whorled” leaf structure. It is particularly invasive be-cause it flowers (inconspicuously) prolifically from late June – September and the flowers pro-duce round seeds that STICK TO EVERYTHING! I can tell you that the seeds are virtually im-possible to pick off clothing. They don’t even come off in the washing machine. Therefore, the seeds are easily transported by animals and hu-mans to other locations.

Carpetweed is a particular nuisance in cultivated areas such as farm fields, garden beds or newly seeded lawns. It is commonly confused with Catchweed Bedstraw (Calium aparine). Catch-weed bedstraw has a square stem while carpet-weed stems are round. The only good thing to be said for carpetweed is that it is easily pulled by hand. Which is a good thing because if you have it in your yard, you will be pulling lots of it.