well spring has come and nearly gone! Uni has kept me to busy and I have not repotted any of my trees

is it too late to repot, juniper, evergreens in general, azalea, pyracantha (about to fruit) and indian hawthorn
Also! i purchased some diatomite a month ago from enfield, but it was terrible ( and yes i have read the discussion on here about the topic) i have contacted the manufacture and am about to send a sample. is there another source of diatomite in Sydney? what are others doing? if it becomes to much of a hassle I may end up switching to rays mix.
Cheers
Matt