I see sap leaking from the tree trunk of my Cassia planted last year. Is that normal?It is over 98 degrees in CA.
THE TRUNK HAS leaking sap. The leaves turned brown and shriveled in the heat
From you description I suspect that your Cassia tree has a condition known as "alchoholic flux" as a result of the heat and drought stress. See the following article for more information:
There are other possibilities, especially if the exudation is associated with a wound or cavity.