Does Increased CO2 Increase Weeds?

Some years back, I went to a meeting in Denver sponsored by the Colorado Cattlemen’s Association. I don’t remember the exact title, but it was something about how ranchers could adapt to a changing climate.  Scientists explained what their research was telling them about plant responses to increasing CO2 in the atmosphere, and shared computer models of how the weather might change in different parts of the country. As is normal for scientists, their talks were laced with the words, “pr

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One thought on “Does Increased CO2 Increase Weeds?

  1. Last summer in 3rd yr of holistic grazing I first noticed a very definite increase in patches of smooth Brome and Canadian T may also be expanding. Our cattle love both, and I attribute this development to our grazing program, which might be described as “mini-mob, relaxed Holistic version of Greg Judy’s” in style.
    This spring the Brome patches are even more prominent, and they get grazed down to 1″ within an hour or two Happily they are regenerating noticeably within days. If it weren’t for winter, I’d be worrying whether my Ky31 toxic fescue will get pushed out.
    After reading the above, it occurs that the story may be more complicated than first thought. As you know Cheat is a cousin of Smooth Brome. Moreover I noticed a patch of very lush Brome just outside our perimeter which has never been grazed. Maybe CO2 is the prime mover here too?

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