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Blocking Mix Recipe

For 20 cups (makes approximately 500 mini ¾” blocks or 36 of the 2” blocks)
16 cups sifted peat moss or coco fiber
4 cups sifted compost
¼ cup greensand
¼ cup rock phosphate powder

Mix ingredients dry. Mix 3 parts dry mixture to 1 part water.

Larger Volumes
4 gallons sifted peat moss or coco fiber
1 gallon sifted compost
1 cup greensand
1 cup rock phosphate powder

Mix ingredients dry. Mix 3 parts dry mixture to 1 part water.

Mixing tub suggestions: kitty litter box, cement mixing tray, wheelbarrow or a rigid baby pool.

Best tool for mixing: use an old-fashioned potato masher to mix water with dry mix.

Storage of unused blocking mix: allow the unused portion of blocking mix to dry out and store in a breathable manner. It can be re-wet and used next time.

About the nutrients: In the event you cannot locate the nutrient ingredients perhaps you can find a substitute that is similar.

  • Greensand is used for its broad spectrum source of micronutrients as well as potassium. It contains about 3% total potash, along with iron, magnesium, silica and as many as 30 other trace minerals.
  • Rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate bearing minerals.

Click here for a printable version of the Blocking Mix Recipe.