Poison Ivy is worst now too.
I had heard years ago that poison ivy grew better with more carbon dioxide in the atmosphere and I expected that was why we see such a proliferation of it these days.
I recently stumbled upon an article about a (2006) six year study by Duke University. They enhanced the cO2 in the Duke Forest and monitored the vegetation. And yes everything did grow faster, but the vines did better.
The trees grew about 8% more but the Poison ivy grew an incredible 149% more! AND the plants produced a more toxic form of urushiol.
In my observations the PI is way worst than it used to be.
--Ken
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