Fertilizing a Spider Plant must be done in moderation. We recommend feeding your plant sparingly with an all-purpose, complete, water-soluble fertilizer suitable for houseplants. You can also use a granular time-release fertilizer however you are comfortable. Fertilize your Spider Plant once every two weeks during its growing period. Feeding a plant during its growth dormancy could damage your plant. If you notice the tips of your plant turning brown, back off on fertilizer and see if that fixes the problem. Do not worry; they thrive in less-than-desirable conditions and should have no problem bouncing back.