Why Worm Castings Are Called Black Gold

Worm castings — also called vermicompost — are the digested organic material produced by earthworms. The nickname “black gold” is well earned: no other organic amendment delivers such a complete package of readily available nutrients, beneficial microbes, and humic acids in a form plants can use immediately.

What Makes Them Special

Unlike raw compost, worm castings go through the earthworm’s digestive system multiple times. This process:

• Concentrates nitrogen, phosphorus, and potassium in plant-available forms
• Inoculates the soil with beneficial bacteria and fungi
• Produces humic acid, which chelates nutrients and improves soil structure
• Creates natural growth hormones that stimulate root growth

How We Use Them

Daley Organics includes worm castings in both Daley’s Mix and Premium Soil Mix as part of our complete fertilizer blend. Every yard of premium growing media delivers a meaningful dose of worm castings alongside 20+ other organic amendments.

Read the full worm castings ingredient profile to understand why they’re ingredient #1 in our fertilizer blend.

Application

Mix up to 20% worm castings by volume into your soil or potting mix. You literally cannot over-apply them — they are completely safe for seedlings, transplants, and established plants alike.