u/Interesting_Rub5210

Sorry the video is a bit poor. We planted this bamboo a couple weeks ago and I went to check it today to find a couple stalks are turning dark. I wasn’t sure if this was normal or not. We live near Portland OR for context. I was looking online and thought this could be because maybe it’s receiving too much water based on other posts I saw online but the stalks are all still pretty taught. I’m hoping someone on here could help me determine what this is since this is my first bamboo plant and I’m not familiar with what to expect from them.