New tree dilemma
Hi, i have a fairly newly planted garden (3 years now) and have a dilemma. Existing trees still have a long way to maturity are Amelanchier Lamarcii, Cotoneaster Cornubia, Cotinus Coggygria, Prunus, Small magnolia and a multi stemmed birch. All of these existing trees are doing well but have a lot of growing to do.
Our gardens main wide border runs next to a pavement (5 ft wooden black fence) and busy main road and traffic lights - the garden is to the east and road to the west. The objective is to provide screening and privacy from the road in a light feathery way rather than dense screening which would shade the garden too much. I have to be patient for these things to grow but have a gap which I would like to fill with a young tree and I would like to get a reasonable sized one 5ft plus. We are on clay.
Choices are narrowed to weeping birch, black bamboo or acer palmatum sangokaku. Any advice or experience of these trees in respect of ease of establishing, keeping to a reasonable size etc would be appreciated.