Pruning rarely needed. Generally tolerant of urban conditions. Noteworthy Characteristics Pinus mugo, commonly known as mugo pine or Swiss mountain pine, is a broad-spreading pine which is native to the mountains of central and southern Europe. It will grow to 20’ tall, but is often seen much shorter in a shrubby form. Dark green needles (1-3″ long) appear in bundles of two. P. mugo var. pumilio is a dwarf variety with a dense, spreading form. It often grows prostrate with upright branching.