Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
Mugo come in many sizes. Our largest is 6'Hx10'W (30 yrs. old) with yearly pruning. This is simply cutting or twisting off the new growth on top. They'll get 12 to 15'H though. Plenty of old and new cultivars though that are smaller only reaching the height Toni's talking about. I have one 30 year old that's about 30"Hx5'W without pruning. One of my favorite "dwarves".