Lucky bamboo sometimes suffers from mold that appears on its leaves or its stalks. The mold isn't harmful to the plant, but is at times, unsightly. There are easy to do home remedies to kill or stop the mold from continuing to form. One very good way to prevent the mold from appearing in the first place is to keep the water and the pot clean.
First, make sure that you change the water and clean out the rocks and pot where the bamboo is situated. If this doesn't stop or kill the mold from growing then you need to "wash" the plant itself.
To wash the plant, you want to soak the bamboo in water for at least one hour with a squirt of dish washing liquid or baking soda (diluted three teaspoons to one gallon of water). Another way to use the baking soda, is to spray the diluted solution onto the plant once a day until the mold starts to disappear.
Some plant growers also recommend using a 10 percent bleach solution for the pot, which is one part bleach diluted into 10 parts water.
For prevention, make sure that you keep both the water and the pot that the bamboo sits in clean. If you smell a moldy odor coming from the water you know that it is not clean and you need to change it.