What do you feed?

I'm no expert and think your questions could also be mine. I feed tomatoes fairly regularly with commercial feed and a bit of homemade. I never have faith that my homemade manure/comfrey/weed tea has all the nutrients the tomatoes crave. Shrubs and perennial plants might get a bit of BFB and/or chicken pellets in the spring. Annuals get planted in compost and that's their lot. Tubs get some haphazard Miricle gro. I currently have a very poorly miniature rose with yellowing and dropping leaves and am trying to decide whether it's chlorosis, overwatering or disease.