@MissConstrue goldenrod! would need a better look at the leaves to know which one, but there’s many goldenrods which are native to north america so if its shown up in your yard randomly i’d assume it’s one of the native ones
please ignore anyone telling you it’s an allergen — that’s an urban legend based on the fact that it blooms at the same time as ragweed, which many people are allergic to. as a general rule of thumb most of the bad allergy plants are wind pollinated (which is why they’re putting so much pollen in the air) so you wont see a ton of pollinators on them
@MissConstrue what a lovely project! i live in a city, so i don’t have the space for a full prairie garden like you, but i’ve been planting native plants in the median and the tree pits near my house and it’s amazing how many bugs and birds just those small scraps of green can support