Hi Ian, this is a common problem with how oioi is often planted (which is no criticism at all, as it is very often planted in this way, in a lot of scenarios). One high profile public planting in Auckland has received the crewcut recently, and I have seen it many times before. It is best to plant it further back from an edge, to avoid the foliage falling over, as it does this periodically (usually every year or two) as part of its natural growth patterns. Some other similar plants are a bit better for avoiding this problem (such as the sedges, Machaerina juncea, and Lepidosperma australe), although they are not quite equivalent to oioi. The best method of tidying them is to cut stems selectively right back to the base, but this is very time-consuming.