Fertilizers provide tomatoes with essential nutrients to help them thrive.

How to Fertilize Tomatoes With Neptune's Harvest

by Melissa Lewis

Juicy, sweet, fresh from the garden tomatoes (Lycopersicon esculentum) don’t just grow on their own. It takes ample water, good soil, plenty of sunshine and an adequate amount of nutrients to reap such rewards. Neptune's Harvest Organic Fish/Seaweed Blend Fertilizer is a fertilizer that combines fish hydrolysate and seaweed that result in a 2-3-1 nitrogen, phosphorus, potassium ratio. Tomatoes benefit from a good amount of fertilizer mixed into the soil before planting. Because this product has a low concentration of nutrients, consistent with an organic product, and is a water-soluble fertilizer, it doesn't work well for amending soils. It is a better choice as a fertilizer to apply starting when the plants set fruit.

Shake Neptune’s Harvest well before opening. Measure 1/8 cup of the fertilizer and mix it with 1 gallon of water. Shake or stir the mixture. Make only what you need because the mixture does not store well.

Pour the mixture around each tomato plant, covering an area that is about 2 or 3 inches wider than the plant’s canopy to ensure the fertilizer covers the root area. Use enough of the mixture to water the area with 1 inch of water.

Repeat fertilizer applications in the same manner every two or three weeks until the plant dies back in fall.

Items you will need

  • Gallon container


  • Keep Nature's Harvest out of the reach of children and pets.

About the Author

Melissa Lewis is a former elementary classroom teacher and media specialist. She has also written for various online publications. Lewis holds a Bachelor of Arts in psychology from the University of Maryland Baltimore County.

Photo Credits

  • Comstock/Comstock/Getty Images