What factors lead to perfect plant growth?

Vigorous and healthy plant growth in the aquarium is of course never based on just one factor. It is always the interplay of light, heat, fertiliser and the main nutrient carbon dioxide (CO2). If one of these factors is missing or is present as a limiting factor in the minimum, the plant will always only grow as this limiting factor allows.

The simplest example is light: If you provide your plants with sufficient fertiliser, CO2 and trace elements, but only switch on the light for 2 hours, the plants will hardly grow due to lack of light. This is equally true for ALL factors. For example, a lack of potassium or CO2 can severely restrict growth.