Seaweed / Kelp Fertilizer: Complete Guide
A micronutrient-rich organic supplement made from kelp or seaweed. Very low NPK but packed with trace minerals, growth hormones (cytokinins, auxins), and amino acids. Best used as a supplement alongside primary fertilizer.
Key Facts
1N
0.5P
2K
N 1% Nitrogen: leaf and stem growth
P 0.5% Phosphorus: roots and flowers
K 2% Potassium: health and disease resistance
Learn more about NPKNPK Ratio
1N
0.5P
2K
N 1% Nitrogen: leaf and stem growth
P 0.5% Phosphorus: roots and flowers
K 2% Potassium: health and disease resistance
Learn more about NPKFormliquid concentrate
Application Rate1-2 oz per gallon of water as foliar spray or soil drench
Price~$6/lb est.
Release Speedslow
Burn Riskvery low
Low Risk: Safe application rate for most plants.
What is Seaweed / Kelp Fertilizer Best For?
When Should You Use Seaweed / Kelp Fertilizer?
Use as a supplement for stress recovery, transplant shock, root development, and overall plant health. Safe for foliar and soil application.
When Should You NOT Use Seaweed / Kelp Fertilizer?
Not a standalone fertilizer. NPK is too low to meet plant needs alone.
Source:Oregon State Extension