The Blog

Anne F in with knotweed

A research paper has just been published about the difficult invasive weed, Japanese knotweed. Seems that in some kinds of forests, this weed is taking over the understory and preventing new tree saplings from growing, thus threatening the future of these forests. 

November 15, 2017 - 5:53pm
fall poison ivy

Up here in central New England, 2017 has had an extremely late first frost. (I wil forgo discussion of global warming to avoid the hate mail that such topics generate.) 

November 11, 2017 - 6:46pm
Virginia Creeper in Turin, Italy

I knew without getting close that this red vine was NOT poison ivy. How did I know for sure?

Because I took this photo in Turn, Italy, and there is no poision ivy in Italy, nor anywhere in Europe, for that matter.

October 13, 2017 - 5:06pm
John Jelesko Lab, the Itchy Project

Watch this short video and consider a donation to help the Itchy Project!

October 1, 2017 - 7:39pm
5 leaf poison ivy

It has been an absolute rule: "Leaves of three, let them be." If a plant has more than three leaves (or leaflets) in a group, then it simply can not be poison ivy.

September 28, 2017 - 12:06pm
pokeweed

I have been getting a number of images of a strange looking plant asking if it is poison sumac. And it is a strange one, with big berries that turn purple. But it is NOT poison sumac.

September 25, 2017 - 1:36pm
poison ivy in fall

In spite of its generally tough-guy attitude, poison ivy is one of the first plants to give up and turn colors in the fall. Which makes early fall a great time to look for it. Often you can find trees, walls, or the ground itself covered with bright red, orange and yellow leaves.

TAGS: autumn, fall
September 14, 2017 - 10:31pm
3 - leaved Virginia Creeper

Virginia creeper is supposed to have 5 leaflets in a group. Normally it does, but occasionally it gets "lazy" and only give out 3. Which is a problem for people trying to distinguish it from poison ivy, which always has the the leaflets.

September 5, 2017 - 10:51pm
pacific poison oak map

We have been wondering for years, and still wonder: with so much terrrible poison oak throughout California, why are there no poison oak plant control services?

August 21, 2017 - 4:57pm
poison ivy attacking door

Those wacky guys at Umar Mycka's The Poison Ivy Horticulturist sent us a real nightmare image of poison ivy taking over the side of a house and reaching for the doorknob!

August 15, 2017 - 11:50am

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