My spider plant looks quite healthy, very seldom has any brown ends. I water usually once a week well. My problem seems to be that my plant is growing "up" instead of going down around the planter. Is there something I need to change? I have about 5 different plants in the pot so am wondering if that is an issue? I also have never fertilized, so do I need to and with what type of fertilizer? Thank you for your help, especially about it growng upwards.