Langbeinite - Seacliff Organics Living Soil Amendments New Zealand


: In stock

: Seacliff Organics

: Amendment


Potassium Sulphur Magnesium

Langbeinite is a naturally occurring mineral with a neutral pH. 

It has 3 essential nutrients, potassium which is important for CO2 uptake, magnesium, which is essential for the development of chlorophyll and sulphur which is key to enzymatic reactions. Its low chlorine content is unlikely to burn plants and is perfect for mixing into a solution or adding directly to the soil.

Langbeinite slowly dissolves in water, giving you a slow release of it's three main chemicals, and unlike other sources of magnesium won't affect the pH of your soil.

Be mindful that the magnesium component of Langbeinite is more soluble than the calcium or potassium

Recommended Usage

Vegetable Gardens & Flower Beds:

New gardens
  • Apply 50 – 100g/m2 and thoroughly mix into the top 75mm of soil.
Established plants
  • Side dress 1-2 tablespoons per plant, depending on size of plant, once each month during the growing season.


New plantings
  • Mix ¾ cup on 50ltr of soil and mix thoroughly OR 650g – 1300g/m3 = 2 ¾ cup – 5 ½ cup.
Established plants
  • Lightly mix 2.5 - 5 teaspoons per 10ltr soil into the surface once each month during the growing season.

Trees & Shrubs

New Plantings
  • Prepare a transplant hole and mix ¼ – ½ cup with the backfill soil (60g – 120g). Use amended soil to fill in around the new tree and water in well.
Established Plants
  • Spread ½ -1 lb per 1″ of trunk diameter (1- 2cups) around the base outwards to the drip line, mix into soil surface and water in well. 

Row Crops/Acreage

  • Apply 200-500 lbs per acre depending on soil analysis, research data or specific crop needs (20g – 60g/m2).


Potassium (K)



Sulfur (S)



Calcium (Ca)



Magnesium (Mg)