The Blog

Black ring of poison ivy vine

This is a photo of a poison ivy vine that was chainsawed along with the tree that it was climbing upon.

TAGS: black sap
May 22, 2018 - 11:40pm
Virginia Creeper versus poison ivy

Here we have two vines that are constantly mistaken for each other, and for good reason: they often grow side by side, or even intertwined.

On the left are two 5-leaflet Virginia creeper leaves, coming from a thin vine. 

May 12, 2018 - 4:23pm
spring poison ivy

I had a conversation with the fellow who runs one of America's leading poison ivy control services.

He grew up very much an outdoor kid, had constant contact with poison ivy, while hunting, fishing and just generally being an All-American kid.

TAGS: age
May 7, 2018 - 10:08am

It has been a cold, late spring up here in New England, but today will reach the mid 80s, so plants will be exploding into full leaf.

TAGS: spring
May 2, 2018 - 10:01am
5-leafed poison ivy

It has been an absolute rule for over a century: "Leaves of three, let them be." 

Poison ivy has only three leaves (actually leaflets) in a group. And that is still true about 99.9999% of the time.

TAGS: Jelesko, 5-leaf
April 13, 2018 - 11:47am
LARGE poison ivy

As spring rolls around, poison ivy is one of the first plants to emerge. Spring leaves are usually red, but many new leaves are red, so that's not enough to go on. See our ALWAYS-NEVER criteria for deciding if a plant is poison ivy.

March 28, 2018 - 11:22am
poison ivy stump

When you cut down a tree, the sudden presence of sunlight encourages poison ivy vines to grow into the gap.

Here is a stump where the  white snow highlights how the vines, with nowhere to climb, start reaching in all directions, looking for something else to climb up.

TAGS: stump, winter
March 14, 2018 - 9:39pm
poison ivy barn

I had appeared on local media, talking about my favorite topic: poison ivy. After the show, a fellow contacted me to tell me about an abandoned barn in New Hampshire that he said I had to see.

February 23, 2018 - 5:15pm
poison ivy in winter

When poison ivy climbs it grows thousands of tiny red root hairs to attach to the tree, wall, or other vertical surface.

TAGS: winter
December 22, 2017 - 11:11am

When the leaves fall, many trees, fences, and buildings are revealed to be covered with masses of poison ivy vines. See how this very aggressive vine covers not only the poor tree, but also layers of other poison ivy, all scrambling upward in a nasty competition.

TAGS: winter
November 27, 2017 - 11:08am

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