Browning leaves are a result of exposure to fluoride in the water. Fluoride is often in municipal water supplies. If you live in an area with municipal water, we recommend using bottled water to water your plants. If watering every time with bottled water is not an option, you should water your plant at least once a month with bottled water. Doing so will rinse out the fluoride in the soil and help your spider plant thrive. An alternative to this is to collect rainwater and use it to water.