This is one of the most undeservedly maligned plants out there. Everyone believes it is responsible for the hay fever (runny nose, itchy eyes, etc.) which really begins to affect people about the same time as these yellow flowers appear. In reality, it is not the goldenrod that is the cause. Another plant, one with non-descript green flower that blooms at the same time: ragweed.
I used to be terribly allergic to grass, tree and especially ragweed pollen. From mid-August to October I would be one messed up person. And then it would start all over in mid-April when the trees would start blooming. I have undergone desensitization shots to reduce the problem to almost nothing. Still, when it's time to pull ragweed from the garden up north, I don my long sleeve shirt and leather gloves because if any part of the plant touches bare skin....
I used to be allergic to bee and wasp stings, too, but a long series of shots fixed that problem and I no longer have to face the possibility of sudden death should I run into a yellow jacket (a type of wasp) or fifty.
The goldenrod flower blooms just when many flowers have faded and its many florets supply pollen and nectar for insects well into the fall. In fact, while milkweed plants and flowers may fuel the Monarch Butterfly's caterpillar and young adult, it is the goldenrod in one form or another that sees that it can migrate south in the fall.
These may not be my favorite insects (Yellow Jackets) but this is one of the busier fueling stations in the yard right now.
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