Last year I had 30 metres of lleylandii taken out of my garden and replaced with a 6 foot fence with trellis on top. This provided me with a long bed of varying depths which I dug using sand, grit and manure. I decided to keep just one small weigelia and two variegated holies and these are now my only shrubs apart from one climbing rose. I also have two zebra grasses, which I love, and these are now about 5 foot. The beds are full of perennials of varying height plus summer flowering clematis growing up the fence, but I now realise I do need either some shrubs or small trees to hold it all together and to block out the fence.
Having struggled with the roots of the lleylandii and subsequent poor soil for so long, I am now enjoying being able to watch the perennials flourish so am reluctant to plant anything which is going to present the previous problems. So, I am looking for advice, please, on relatively 'slim' shrubs which will grow to about 6 foot and small trees which will grow higher than the top of the trellis. I really am only a summer gardener and can't see much of the garden from the house so am not too bothered about winter colour.
The garden is south facing and I still find the occasional small area of clay