Susanna, A standard cypress which is evergreen could work. I have two cypress or juniper looking standards which are ground covers that are grafted onto a set height, my two plants are 1mtr and 1.5mtrs respectively. They are planted in the ground right beside a concrete fishpond and they have shown no sign of disruption. The major growth is usually only in trunk size and the foliage or span of my golden variety reaches over a metre now, so it doesn't cast much shade but is spectacular all the same. I'm currently away from home but when I return tomorrow, I can attach a photo of both my standards and botanical names if you'd like. Cheers, Barbara

I agree with Jabinika that it doesn't look great just now. However if storage is an issue its a wasted space, and should be put to work. It looks as though many things are not yet finished. With lots of light paintwork and some aesthetically pleasing storage boxes, I feel it will do well. It would be good to see a pic of it complete.

We underplanted our ornamental pears with viburnum ‘Emerald lustre’ I just love this plant, it withstands all weather conditions and always looks great with shiny lush foliage, I would add a watering system so your trees and hedge don’t compete for water and it saves you time also.

looks like one of the Philodendrons or similar plants that are usually grown in pots as indoor plants but anything growing in brickwork needs to be removed to avoid damage to the wall