This is Phylostachys nigra punctata 'Giant Black'. Gets to 60 feet tall with 4 inch culms. There is another variety called 'Daikokuchiku' that comes from a grove in Folsom that is about 57 feet tall, fairly rare and hard to get. To give some perspective, regular black grows to about 30 feet tall max with 2 inch culms. There is a smaller version that I am hoping to get as a trade here soon that was referrred to as "Baby Black Bamboo" formal name is Phylostachys nigra 'Hale'. 20 feet max. These are all running bamboo, but they perform really well in containers, like large pots or horse troughs.