Phyllostachys Nigra "Black Bamboo' is a very unique and sought,Website:http://www.tonkinbamboos.com,As the Summer progresses into Fall, the green culms begin to develop brown mottling concentrated atthe nodes, especially near the bse. By Winter the entire culm is speckled with fine black spots, usually dense enough toward the base to be solid brownish black.In China,the diameter from 15-50mm,bamboo poles use for decoration,This exotic species is very popular for indoor and outdoor decoration Markings are natural,black with hints of brown.Production:Usually we have diameter 15-20mm,20-25mm,25-30mm,30-35mm,35-45mm poles for sales,for fence,usually we sale diameter 18-22mm,25-28mm,35-45mm,can be customized the length and width.