Hedging, a living wall...decorative, privacy, windbreak. Growing hedges is a great way to create private spaces around your home. They grow densely, generally low maintenance, natural and provide a nicer view than a fence.
Spacing, a decision determined by budget, desire and conjecture. The closer you plant, the faster the hedge will form. Planted too far apart means a sparse hedge. The closer, more plants, more money. Further apart the cheaper it will be.
If you have to compromise for cost reasons just be aware that the hedge may look a little thin for a while.
A fifth to one quarter of the average width of the free standing plant apart,
e.g. a plant width of 2.5-3m will require a spacing of 0.6m.
Multiply your desired hedge height by 0.3. For a 1m high hedge, each plant will be planted 30cm apart, a 1.5m high hedge they will be 45cm apart.
To grow a hedge, space the plants about a quarter of their maximum growing width apart. So if they grow 2m wide, plant them 500mm apart.