Is this plant a flowering one or just a weed?
You have a type of goldenrod (Solidago spp.) Some people consider it a weed. Others look at it as a native plant and some, including myself, actually plant it and encourage it.
Many people have the mistaken idea that goldenrod aggravates allergies. This is not true. It just happens to flower at the same time as common ragweed which is a known allergen. Goldenrod seeds are too heavy to be carried any great distance by air.