There are many factors that determine the amount and type of fertilizer to use, such as amount of sun, temperature, water, and type of plant. Each plant varies in its requirements. It should be noted that fertilizers are not used to correct cultural problems. So, if the environment is not right, the use of fertilizers will not help the plant. Also remember that excessive fertilization can lead to algae problems.

Generally, slow release tablets or granular fertilizers with an analysis of 20-10-5, 5-10-5, 10-6-4, or 12-8-8 are all acceptable. The recommended rate for water lilies and lotus at the time of planting is four ounces of fertilizer (mixed into the soil) for every one cubic foot of soil. After that, monthly applications can be made up until about August.