Rockweed (Ascophyllum nodosum)

Rockweed from Seaweed Kings is recycled, upcycled, and sustainably hand-collected from the cleanest American waters along the coast of Maine. We offer highly competitive pricing against the market and can deliver bulk quantities direct to your facility.

Rockweed Applications in Farming

Seaweed Kings rockweed can be used in top-dressing directly applied with soil mix to fields and can also be used in a concentrated liquid extract. Our rockweed has a low NPK, as such, can be applied to stimulate plant growth and replenish nutrients in soil. When used as animal feed, our rockweed offers a number of benefits to the health of your animals as well as the environment.

High Yield, Healthy Crops

Rockweed adds organic matter to soil, aiding soil in moisture retention and crops in healthy root growth. Breakdown of Ascophyllum Nodosum in soil repels pests and increases beneficial microorganism populations. Rockweed is a natural slow-Release fertilizer, supporting nutrient acquisition and accumulation.

Rockweed has been shown to

  • Stimulate plant growth and nutrient absorption
  • Enhance drought and freeze resistance
  • Improve stress tolerance & salinity tolerance


  • Boost defense mechanisms against disease
  • Increase fruit quality, crop yield, and biosynthesis
  • Encourage cell division & chlorophyll production

Raise Healthy Animals

Our economical and nutrient dense rockweed offers many advantages when used as an additive for animal feed. It’s numerous benefits will aid you in growing healthier and stronger animals with strong immune systems naturally.

Benefits for your animals

  • Reduce methane emissions
  • Reduce internal parasites in pigs
  • Strengthen your animals’ immune systems


  • Increase breeding efficiency
  • Enhance wool production and quality in sheep
  • Improve overall production: weight gain and milk fats

Rockweed Applications in Landscaping

Our responsibly harvested, all natural rockweed is one of the best supplements you can use for your lawns or gardens. It is so effective and reliable that it has been a trusted product used by many professional golf courses and football fields across the country. Regardless what stage of life your plants or lawn are at, you will be able to enjoy all of the benefits that rockweed has to offer.

Benefits for lawns and gardens

  • Increase chlorophyll resulting in richer green leaves and grass
  • Enhanced root growth in both rate and mass
  • Added resistance to disease and freezing


  • Increased flower production for flowering plants
  • Larger and better tasting fruits and vegetables
  • Flowers stay fresh longer after being cut

Nutrients & Benefits

60 minerals and elements including

  • Calcium
  • Magnesium
  • Sulfur
  • Cobalt
  • Boron
  • Copper
  • Iron
  • Manganese
  • Zinc

12 vitamins including

  • Vitamin A
  • Vitamin C
  • Vitamin E
  • Vitamin B12
  • Thiamin
  • And more

21 amino acids

  • Histidine (His)
  • Isoleucine (Ile)
  • Leucine (Leu)
  • Lysine (Lys)
  • Methionine (Met)
  • Phenylalanine (Phe)
  • Threonine (Thr)
  • Tryptophan (Trp)
  • Valine (Val)
  • Arginine (Arg)
  • Cysteine (Cys)
  • Glutamine (Gln)
  • Glycine (Gly)
  • Proline (Pro)
  • Serine (Ser)
  • Tyrosine (Tyr)
  • Alanine (Ala)
  • Asparagine (Asn)
  • Aspartic acid (Asp)
  • Glutamic acid (Glu)
  • Selenocysteine (Sec)

Natural Plant Growth Regulators

  • Cytokinins
  • Auxins
  • Gibberellins

* These statements have not been evaluated by the Food and Drug Administration. The products on our site are not intended to diagnose, treat, cure or prevent any disease. Information on this site is provided for informational purposes only. It is not meant to substitute for medical advice from your physician or other medical professional. You should not use the information contained herein for diagnosing or treating a health problem or disease, or prescribing any medication. Carefully read all product documentation. If you have or suspect that you have a medical problem, promptly contact your regular health care provider.