We stopped feeding our bonsai about 3 weeks ago. Toward the end of September we will treat them all with 0-10-10 to help them get ready for winter. The last month has been used to defoliate Japanese Maples, trim the big Chinese Elms, work on all the different trees that are growing here.
This time of year is the “Dog Days”, it is so hot that going outside for an hour can be a real effort. Drink lots of water and make sure your bonsai are given plenty of water also. The Maples that we defoliated three weeks ago are making such nice small (and green) leaves to replace the ratty brown ones that were just hanging on. Not many pests this time of year for us