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I'm wondering what this is. It's nothing I planted, which makes me suspicious, but we have so many glorious trees thank to the squirrels, thought I'd check before pulling. Thank you! Sue


Invasive Japanese Hop Vine Hello Sue
What you have is definitely a weed. It is called Japanese Hop Vine (Humulus japonicas) a member of the Hemp family. As can be seen in your picture, the leaves have 5 distinct lobes; when you touch them they are rough to the touch. This plant originated in Asia and was imported into this country in the late 1800's for use as an ornamental vine and tonic. Unfortunately, it is very invasive and it has become widespread throughout the northeastern US. Japanese Hop Vine likes fertile soil and sunlight; in the right conditions it can grow rapidly - to heights over ten feet and 35ft in a year! If left unchecked, it can form dense mats several feet thick. The good news is that in our region it is an annual (dies every year in the cold weather) but regenerates from seeds it disperses the previous year in the early fall. Seeds can remain viable for up to three years in the soil, so the trick is to pull it when you see it and you'll eventually win the battle. Use black plastic bags for disposal and put out with the trash to go to the incinerator.

Japanese Hop Vine has a famous native cousin, the Common Hop (Humulus lupulus), that you may also encounter. Common Hop looks similar to Japanese Hop, except it is generally 3-lobed and it is a noninvasive perennial. The female flower cones, called "hops", have been used in beers for centuries for flavor and preservation.

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About Linda Lillie

Linda K. Lillie is the President of Sprigs & Twigs, Inc, the premier landscape design and maintenance, tree care, lawn care, stonework, and carpentry service provider in southeastern Connecticut since 1997. She is a graduate of Connecticut College in Botany, a Connecticut Master Gardener and a national award winning landscape designer for her landscape design and landscape installation work.


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