10 Best Fish Fertilizer For Plants 2025 in the United States

Neptune's Harvest Fish & Seaweed Fertilizer 2-3-1 is a liquid fertilizer that combines fish and seaweed to provide essential nutrients for plant growth. The NPK ratio of 2-3-1 means it has 2% nitrogen, 3% phosphorus, and 1% potassium, which supports balanced plant growth, flowering, and root development. Its liquid form makes it easy to mix and apply using various methods such as hand watering, sprayers, or drip lines, making it versatile for different gardening needs.

The GS Plant Foods OMRI Listed Fish & Kelp Fertilizer is an organic liquid fertilizer that combines fish and seaweed to promote plant growth. Its NPK ratio, while not explicitly stated, likely balances nutrients from both fish and kelp sources. The fertilizer is in liquid form, making it easy to mix with water and apply to various plants, including vegetables, trees, lawns, shrubs, and flowers.

The ALASKA Fish Emulsion Fertilizer 5-1-1 concentrate is a versatile liquid fertilizer suitable for a variety of plants, including house plants, fruits, vegetables, ornamentals, and shade trees. Its 5-1-1 NPK ratio is beneficial for general plant growth, offering a higher nitrogen content which is ideal for leafy growth and robust plant health. As a liquid fertilizer, it can be easily mixed with water using the specified 1:10 mixing ratio, making it convenient for application through watering cans or sprayers. This is a significant advantage for users looking for a straightforward and quick application method.