Hi every one

I have three bamboos that are healthy and in good shape. since 2 month ago some algae has started growing up on routs and they are getting more. I find out that 2 leaves get yellow today. lI don’t use any fertilizing product for them. I just change the water every month with fresh water that was keeped aside for a while to get ride of cholorin . I also wash all parts of plant once a month.

doese anybody know how can I remove algae from routs?

Thanks