It's always tough trying to find a hedge that will grow in sun and shade, especially when you want a uniform look. Having said that, it isn't uncommon for designers to use a couple of different species - for example one species to boundary fences with another to the front fence. I'd consider lifting the canopy of the existing trees to let light in for more even growth across the hedge, however I'd still expect it to be a bit uneven due to the varying conditions throughout the garden. Viburnum tinus is a good pick for both a sunny position and a shady position, it will eventually get to 2m height and can be kept as low as 1m. If this isn't large enough, you could also try Portuguese laurel, (Prunus lusitanica) which will get to 4m easily enough. Both of these aren't particularly fast growing, but with adequate water and food they should be good for your situation. Murraya is another one that will tolerate sun and shade, though not frost. You won't get as many flowers in shady positions, and it may look a bit straggly. Your local nursery may be able to advise on what is readily available. When you plant, preparation and ongoing care is going to be important as it look as though you have a few plants that the hedge will have to compete with as it establishes (your neighbours conifers and your pears). Digging a good wide planting hole, plenty of organic matter mixed with the back-fill, as well as regular watering and feeding until the plants get established. Much as the Flower Carpet Roses are tough (especially the original pink), I wouldn't recommend planting roses in anything less than 4 hours of direct sun a day. You'll end up having issues with blackspot and mildew, and they're not going to give you the neat box look that you want. Flower Carpet Roses (Tesselaar Roses) are a good tough rose, however some colours (cultivars) are tougher than others. Pink is one of the best performing varieties, and as suggested, reaches a bit more than the height on the label. That may not be true of all the different colours though. Be careful propagating any of the flower carpet roses, only ever for yourself as they are rigourously protected either with trademark names and/or Plant Breeders Rights, making it illegal to sell the propagated material under the flower carpet name, or at all (in the case of PBR). Good luck!

It always makes my heart sink when a client asks for a "no-maintenance" garden. It tells me they really don't care. In truth, any planting needs a certain amount of care. Plants, like animals, need care. It's true that they're slower than animals to respond to deprivation, but respond they do. And it's not a good look. You might not have a lot of time, or you may not be physically up to a lot of gardening. That's fine - you can choose plants that require a minimum of care and grooming, and if need be hire somebody to do that minimum. But it does require planning. A gardener actively engaged with their garden can (and will!) experiment, try new things, move plants around, notice when things are going right and wrong, and for them a garden is never finished. Contrast that with somebody who wants a garden they don't want to work in or at. They want a garden that is more or less "finished" the day it is installed, rolled out like a stretch of lawn and meant to "behave", to stay static. I can't do a garden like that! Plants grow! They change, the environment around them can change, and what might have succeeded one year is not going to do it the next. It is entirely usual for a planting that just nicely fits a situation to need complete re-planting a few years on because the individual plants have outgrown the site. That's work! It is entirely usual for plants to flower, and for those flowers to set seed and die off. It is entirely usual for some plants to shed leaves as part of their yearly cycle. This "mess" is treated by non-gardeners as a crisis, as a nasty surprise, as something the plants "shouldn't" do. Because it makes work. Well, sorry, but no garden consultant can change the laws of nature. If you want a garden, you've bought work, and if you don't want to do it, you're going to need to pay somebody else. That's fine. Just don't ask for what you can't have.

Not sure how it would go in Brisbane but what about trying a conifer? They grow fast and very tall. You can shape them or leave them natural. They are plain and certainly not tropical. Maybe speak to a local nursery and find out if they would grow in the sub-tropical climate of Brisbane first, as they are usually in colder climates (Sydney and south). Leightons Green Conifer – Leyland Cypress http://www.evergreengrowers.com.au/shop/hedging-screening/leightons-green-conifer-leyland-cypress/ Your quite limited if there's not enough sun and you dont use bamboo or tropical plants. Many other screening plants or hedges wont get tall enough for that space and climate. I hope you find something.

Congrats on choosing blocks for your garden bed. If you're looking for trees, I suggest considering a maple tree. They grow nicely over time, providing shade and privacy. I recently moved to a new house myself, and I'm also exploring plant options. Back in my hometown, we had a reliable tree service that helped us with planting and maintenance. Maybe you can find something similar in your area. I came across this website, https://www.deepdale-trees.co.uk , which might be helpful for you. They offer a variety of trees and services.