Our garden is very over-looked by a nearby house, and we would like to plant some trees that will cover their windows and so stop their view into our garden where our young children play. It is a large garden, and so we will need three or maybe four trees to cover that side. We would like trees with high and wide canopys that won't therefore encroach too much into the lawn space, or border space below. the windows to cover are about 12-15 ft high. we would like some variety in colour if possible.
Any ideas gratefully received Thanks!