Do potted flowers need nitrogen fertilizer? A full analysis of fertilization timing

The role of nitrogen fertilizer is to make plants grow more leaves, while phosphorus fertilizer can promote flowers to bloom more, with more flower buds and brilliant blooms, and potassium fertilizer can make flowers and plants bear larger and more fruit, more seeds, and so on. Their respective roles are different.
During the growth process, potted flowers definitely need nitrogen fertilizer, especially some of the foliage plants we commonly grow, such as pothos, spider plant, asparagus fern, and so on. If you want their branches and leaves to be lush, you need to regularly give some nitrogen fertilizer during the growing season.
The best time to supplement flowers and plants with nitrogen fertilizer is spring and autumn. If the place where you are is like spring all year round, then of course you can apply nitrogen fertilizer often. To judge whether flowers and plants can be fertilized, see whether new tender leaves are emerging; if they are, it proves that the vigorous growth period is about to arrive, and you can give nitrogen fertilizer. For example, if buds have already begun to sprout on the branches of Chinese rose, then you can give nitrogen fertilizer.
Spider plant and pothos grow very quickly in spring and also need more nitrogen fertilizer. In fact, soybeans contain nitrogen fertilizer. You can use okara, fermented soybeans, or decomposed soybean water to water the flowers, which can also supplement nitrogen fertilizer.