What are worm castings?

Worm casings (eggs) on Buckaroo Castings in the production area. There can be several worms in each casing!

Buckaroo Worm Castings

Worm castings are a natural fertilizer produced by Mother Nature’s own earth worm.  When an earth worm eats organic matter, the digestive tract actually changes that matter both physically and chemically.  The waste product is a powerful, all natural plant food, called castings.  Castings help increase plant growth and promote a healthy soil environment for the plant’s root system.


Each day, a red wriggler worm can eat half its weight in food.  After about four months, the worms will have chewed their way through most of the compost, nutrient amendments and the bedding material, leaving behind a layer full of nutrient-rich castings. The harvested castings are dark and crumbly and smell like good, rich soil. High in nitrogen and phosphorus and a great source of organic matter, castings are wonderful additions to potting mixes for seeds, transplants, or house plants. Castings can also be used like compost in vegetable and flower beds, as a cover soil for seed beds, and as a top-dressing for perennials.

Sanctuary Soil red wriggler worms are fed only the finest natural ingredients to ensure the highest quality worm castings.  Our worm castings are pure, odor free, chemical free and safe for any organic garden.

Although not necessary, plants can be safely grown in 100% worm castings!  Worm castings absorb water so you don’t have to water as often.  The cylindrical shape of the casting helps to keep the soil loose allowing oxygen to permeate into the soil and into the root system.

Worm castings can be used by any type of gardener for any type of vegetation, even hydroponic gardens.  Worm castings also can be used to create “worm tea.”  Worm tea is made with worm castings which have been soaked in water and aerated. The extra oxygen causes a bloom of the good bacteria, plus the added benefit of nitrogen, phosphate, calcium, magnesium and potash.    The most common way to use the tea is to put it in a hand sprayer and spray your plants or lawn with it. Worm tea will not burn your plants, and it helps repel certain insects.

A soil analysis performed on our castings indicated that the PH level is 5.4 against a target PH level of 6.5.  Our castings contain high amounts of potassium, magnesium, nitrogen, and are a good supply of phosphorus.