There are two weeds pictured (unless you planted a native thistle, which it sounds like you didn't): some type of thistle (it's hard to tell before the blooms open fully), and burdock (likely the more widespread of the two, Lesser Burdock). The latter is a non-native invasive species, and the thistle is probably also non-native, given their prevalence over our more scarce locally-native species. Both are members of the very large Aster family of plants, which include many species that pollinators find appealing.

Non-native plants can sometimes support local insects, but not always to the same degree that a native species could, especially as it relates to juvenile insect support (caterpillar host plants, for example). While adult insects are sometimes generalists, able to use the nectar or other resources of many kinds of plants, their young tend to be more specialized, only able to eat the foliage of certain species that they co-evolved with. Even when non-native species support some insect larvae, they tend not to support as diverse a range of insect species (and other wildlife) as our native plants would.

Additionally, and perhaps of equal importance, keeping them around to serve as a nectar source allows these non-natives to spread even further, producing seed (thanks to the services of those pollinators) and invading more natural areas (or other gardens). In comparison, when native species spread by seed, they at least can integrate into the local plant population and ecosystem and be kept more in balance, especially when they are grown in an area appropriate to where that species is naturally found.

We don't recommend keeping an invasive or aggressive non-native species only for its floral resources, especially if it can be replaced by a more location-appropriate plant.

Miri