I have been enjoying the colours of some of the fall wild flowers during the past couple of days. In this first photo, from our east field, one can see goldenrods in the far ground that are often blamed for allergies in this fall season. In the foreground are some green spikes that are the flowers of Common Ragweed. The pollen from those flowers are the real cause of many allergic reactions. According to the literature, the pollen can travel up to 160 km (100 miles) so pulling it out of your yard will not make much difference to your allergies.
This second photo is a very close up photo of a Moth Mullein. It can start blooming as early as the middle of June but sometimes continues until October with the odd flower still showing into November and December if the late fall and early winter are warmer than usual.