NPK Rating

• Most commercial liquid seaweed sprays have an NPK (nitrogen-phosphate-potassium) rating of 0-0-1, making liquid seaweed a gentle additive.
  
  

Growth Hormones

• Seaweed contains many growth hormones; a soil soak of liquid seaweed extract will encourage root growth in young plants. You can also soak seeds for 24 hours before planting to stimulate germination.
  
  

Trace Elements

• Liquid seaweed extract is a complete source of plant-based minerals, containing up to 60 trace elements; mist your plants and they will absorb these nutrients through the pores of their leaves.
  
  

Disease Control

• The foliar spray technique also helps to block disease and discourage sap-sucking insects.
  
  

Alginates

• Alginates, sponge-like starches found in seaweed, hold water droplets near the plant roots, making moisture available to them without drowning them; they also help enrich the soil by feeding myriad beneficial microorganisms such as bacteria and tiny fungi necessary to composting.
  
  

DIY

• Rinse the excess salt off fresh or dried seaweed. Chop into small pieces. Fill about half a plastic trash can with this material, top off with water, cover, and leave to decompose for 2 to 3 months. Dilute 1:1 before use.