I have a Pyracantha which I planted earlier this year. It is located in a
sunny position. The site is well drained and I have kept it well watered
during the dry weather. At first it seemed to be thriving. Masses of
flowers. However, it has now started to drop its leaves.

Can someone please advise me why this could be happening? Is there anything
I can do to revive it?

Your advice would be appreciated.

Les