Only have a couple of Lisbon lemons. Don't have any nut trees. They are more for the coastal area. We are too high for macadamias which are very common toward the coast from us. A few people around here are into chestnuts.
Most rose breeders get black spot. I get some because we get a fair bit of misty weather being on the edge of the tableland country. I use only natural sprays. I keep the fertiliser up to them. i put slow realease after they get their new leaves on and then I give them a good water with sea weed fertiliser every two to three weeks. I lightly prune them mid summer which extends their flowering well into autumn. I nearly always water them after dark. I'll post a few more pics soon.