Male sterile plants are unable to produce functioning flowers and therefore cannot release viable pollen.
The plant often self-pollinates, but the flowers also release pollen that reaches other plants as it floats away on bubbles.
Because seasonal allergies are most often caused by plant life that releases pollen into the air, they can be difficult to avoid.
Plants tend to release pollen in the morning, so by evening much of it may have reached its destination.
It is the only California Cypress species to release pollen in the summertime.
During the second phase, the stamen mature releasing pollen on the fly.
Tossing them on the ground is ineffective because they may release pollen as they dry.
Staminate plants are usually the first to begin flowering and releasing pollen.
An old view held that they may have succumbed to hay fever as new flowering plants released pollen.
They also release toxic, dense pollen into the air in this position so animals don't go near them.