Seven or eight I lost a whole section of pine trees to pine bark beetles. That left me a view of my neighbors house that I didnt like. So I planted bamboo. It filled in and made a nice screen in about 4 years. Bamboo is an excellent survival plant and I would encourage everyone to try and get a small grove growing if you have room. Many vireites are cold hardy to 0 fereinheit. The benefits are many as bamboo can be made into fishing poles, make excellent garden stakes, and could be used to build animal cages. Bamboo sends up shoots only once a year, the shoots are ediatable and dont taste bad. Goats like the leaves an my neighbors goats keep my bamboo from creepinto his property. My bamboo sends up shoots in May and I figure I could survive the whole month just eating them, give me a little time for the garden to start producing.