The summer equinox was on the 21st of June so they should start wanting to flower in the next few weeks. As soon as they detect the decease in daylight time they start to flower........they are very smart weeds.
yeah, I shake my head whenever I see answers like that. In the northeast it becomes 12/12 in mid September at the earliest. The first frost is around mid October, how would any plants ever finish in time if it started right at 12/12. Think about even higher latitudes like canada that have even earlier frost times.