During which time do weeds begin releasing pollen?

Weeds typically begin releasing pollen in the early morning hours, more specifically between sunrise and 9 am. This is due to the cooler temperatures and higher humidity levels during this time, which create optimal conditions for pollen release. Additionally, many common weeds, such as ragweed, have been observed to release their pollen primarily in the morning.

While sunset and evening may exhibit lower pollen counts, this is not the time when pollen release peaks. Midday often sees increased thermals and higher winds which can disperse the pollen but do not necessarily correlate with the time of peak release. Therefore, the morning hours, particularly after sunrise, align with the physiological patterns of many plants, making this time the most relevant for weed pollen release.