What are the nitrogen fertilizers for flowers?

Common nitrogen fertilizers for flowers and plants include rotten vegetables, bean shells, pigeon droppings, eggs and peanut shells. Nitrogen fertilizer can promote the growth of roots, stems and leaves of flowers. Usually, rotten vegetables, bean shells, pigeon dung and water can be put into a container for fermentation. After completion, it can be used as nitrogen fertilizer. If flowers like acidic soil, an appropriate amount of rice washing water can be added when it is mature.