There are several established Pyracantha (common name firethorn) in various forms and situations at Beechgrove but it is the the trained, espalier ones against fence panels and wires that benefit most from a late sumer trim. Pyracantha flower and fruit on wood that is older than one year. Reduce any long, outwardly growing stems of this year’s growth, to 2 or 3 leaves from the base. This will help ripen any concealed berries in the shortening season. Unless tying in for next year, shorten skyward stems to the same length. Such pruning helps create flowering spurs for next year.
Cut outward facing stems back to just a couple of leaves