Trees in Bloom

At this time of year
I can't seem to go near
The Palo Verde trees.

The bright yellow blossoms
Do not attract possums
But swarms of busy bees.

Plus those blasted tree blooms
Make my allergies boom -
All I can do is cough.

And try hard not to sneeze,
Or sniff or drip or wheeze,
When will the blooms fall off?