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Seaweed Foliar Spray

Seaweed supports plant growth with its high concentration of potassium, but should be combined with a fish emulsion because it is low in phosphorus and nitrogen. Making a homemade batch of seaweed foliar spray will allow you to support root growth for young plants, help increase chlorophyll in your foliage, and discourage aphids and other insects from doing damage.

You Will Need:

  • 2 pounds of seaweed (fresh or dried)
  • 5 gallons of water
  • 5-gallon bucket with lid
  • Fine mesh strainer bag
  • Goggles for eye protection
  • Rubber gloves for skin protection
  • PreGro Plant Sprayer


Place a fine mesh strainer bag into a 5-gallon bucket. Rinse all the salt off of your fresh seaweed and place into the fine mesh strainer bag. Pour 5 gallons of water into the bucket and seal the bucket tightly with the lid. Let the bucket of seaweed steep for 3 weeks to allow the seaweed to decompose. Before opening the bucket, get your protective gear on to protect your eyes and skin. Remove the lid and pull out the fine mesh bag containing the decomposed seaweed. The bucket will contain a highly-concentrated brown liquid. Use a strainer, cheesecloth, or fine sieve to make sure any solids that might be in the liquid are removed. Remove 9 ounces of this decomposed seaweed solution and combine with 9 ounces of fresh water, diluting the solution in a 1-to-1 ratio. Pour this solution into the easy-to-fill glass container. Never shake the PreGro Plant Sprayer when the glass container is attached to the sprayer. The PreGro Plant Sprayer utilizes aerosol technology, but does not contain CFCs. For optimal spray, hold sprayer between a 90 degree angle and a 45 degree angle.


Important Tips:

  • Test your homemade liquid fertilizer on a single plant to make sure the solution does not have adverse effects.
  • Spray your plants in the early morning or evening, focusing the spray near the base of the plant as well as on the leaves and foliage.

The PreGro Plant Sprayer

Atomizes up to 18 oz., which covers up to 120 square feet.

Easy to control, this portable hand-held garden sprayer enables you to deliver a continuous and uniform spray to only those plants most affected by unwanted pests.