The Word on Worm Castings: How do they work? What can they be used for?

 

Worm castings are one of nature’s best soil amendments. Also known as vermicompost, worm castings are the nutrient-rich material produced as earthworms break down organic matter. They can provide plants with nutrients while also helping improve the overall quality of your soil.

 

 

Worm castings contain plant-available nutrients along with beneficial organic matter. Because they are gentle and slow-releasing, they can be used with many different types of plants without the high risk of fertilizer burn associated with some concentrated fertilizers.

 
 

What Can Worm Castings Be Used For?

 

Worm castings can be mixed into potting soil for indoor and outdoor container plants or added to garden soil when planting trees, vegetables, shrubs, annuals, and perennials.

They can also be used as a top dressing around established plants or worked into existing garden beds to add organic matter and nutrients to the soil.

 
 

Benefits of Worm Castings

 

• Adds Nutrients to the Soil
Worm castings contain small amounts of essential plant nutrients in forms that can become available to plants over time.

• Supports Healthy Soil Biology
As an organic soil amendment, worm castings can help support the beneficial microorganisms that contribute to healthy, living soil.

• Adds Organic Matter
Adding worm castings can improve the organic matter content of your soil, helping create a healthier environment for plant roots.

• Helps Improve Soil Structure
Worm castings can contribute to better soil structure, which can improve aeration and create better conditions for healthy root development.

• Helps with Moisture Retention
The organic matter found in worm castings can help soil hold moisture while still maintaining the structure needed for proper drainage.

• Gentle on Plants
Worm castings are a mild soil amendment, making them useful around many different plants without the concentrated salts found in some synthetic fertilizers.

 
 

How to Use Worm Castings

 

 

For Seed Starting

 

A small amount of worm castings can be blended into a quality seed-starting mix to provide organic matter and gentle nutrition as seedlings begin to grow. Because seedlings need a light, well-draining growing medium, avoid using pure worm castings as your entire seed-starting mix.

 
 

As a Soil Conditioner

 

Mix worm castings into garden soil before planting to add organic matter and improve the growing environment around plant roots. They can be especially useful when incorporated into established beds along with other quality soil amendments.

 
 

As a Top Dressing

 

Sprinkle a layer of worm castings around the base of established plants and gently work it into the top layer of soil. Water afterward to help begin moving nutrients into the root zone.

 
 

For Container Plants

 

Worm castings can be blended into potting soil when planting containers or added around established container plants as a top dressing. A little goes a long way, so they don’t need to make up the majority of your potting mixture.

 
 

As a Liquid Soil Drench

 

Worm castings can also be steeped in water to create a simple liquid soil drench. This allows you to use some of the water-soluble nutrients from the castings when watering plants. For best results, follow the mixing and application directions provided on the product you’re using.

 

Earthworms have long been a gardener’s friend, and worm castings give us an easy way to put some of their hard work to use in our gardens. Add them to your soil-care routine and give your plants a healthy place to put down roots!