DW 80/20 Compost Blend

A blend of 80% compost and 20% vermicast (worm castings) is one of the most effective soil amendments for gardens because it combines the bulk organic matter of compost with the microbial richness and biological power of worm castings.

Here’s why it works so well:

Why 80/20 Compost–Vermicast Blends Are Ideal

Compost Builds Structure; Vermicast Brings Life.

• Compost (80%) adds carbon, improves drainage, retains water, and loosens soil.
• Worm castings (20%) inject living biology—beneficial microbes, enzymes, and plant growth hormones.
• Together, they feed the soil AND the plant, unlike synthetic fertilizers.

Balanced Nutrient Vailability

• Compost provides slow-release nutrients (like nitrogen, phosphorus, potassium).
• Vermicast delivers bioavailable micronutrients and boosts nutrient uptake in roots.
• The 20% castings amplify compost’s effectiveness without needing a high quantity.

Soil Microbiome Activation

• Vermicast is loaded with living microbes, including bacteria and fungi that:
  • Break down organic matter faster
  • Improve root growth and disease resistance
  • Trigger natural plant defenses
• Compost provides food and habitat for those microbes.

Think of compost as the house, and vermicast as the community that moves in.

Cost-effective and Scalable

• Worm castings are powerful but expensive in large volumes.
• Using 20% gives you most of the biological benefit at a fraction of the cost.
• This makes it perfect for raised beds, transplants, and row crops.

Less Risk of Over-fertilization

• Castings won’t “burn” plants like synthetic fertilizers might.
• The 80/20 mix is gentle, balanced, and safe to use at almost any stage of growth—seedlings, transplants, or mature crops.

How to Use the 80/20 Mix in the Garden

Application	How to Use
Top dressing	1–2” layer around plants and water in
Seed starting mix	Blend with peat/coir and sand
Transplant backfill	Handful in each hole
Raised bed filler	Mix in the top 6–12” of soil

Bonus: Your Soil Will Improve Over Time

Unlike chemical fertilizers that degrade soil over time, compost + castings build living soil that gets better every season.