Q.My Pyracantha shrubs are dropping so many leaves every day
The plants are getting plenty of water. Have not had this leaf drop in the previous years. I have had them planted for 2 1/2 years. They look healthy and have grown immensely but now lots of leaves are dropping every day.
Since you don't describe the leave, I'm kind of shooting blind here, so here's an article with basic info on growing, and on the main disease that might strike pyracantha, fire blight. https://www.gardeningknowhow.com/ornamental/shrubs/firethorn/care-of-firethorn-bush.htm
Make sure that the bushes aren't getting too much water.