About Us

Our Story: 45 Years of Worm Castings, Made in Wisconsin

UNCO Industries was founded in 1976 in Union Grove, Wisconsin with a simple belief: the best fertilizer on earth isn't made in a chemical plant — it's made by earthworms.

For over 45 years we've been perfecting the science of vermiculture, producing 100% pure earthworm castings under the Wiggle Worm brand. Today Wiggle Worm is one of the most trusted worm castings brands in the country, sold at Walmart and Amazon, and used by home gardeners, commercial farmers, and everyone in between.

What makes Wiggle Worm different is what we don't add. No fillers. No uneaten bedding material. No synthetic additives. Just pure, OMRI listed earthworm castings produced the way nature intended — by worms, in Wisconsin.

Our facility in Union Grove produces castings year-round, feeding our worms a carefully selected organic diet that results in nutrient-dense castings packed with beneficial microbes, humic acid, and water-soluble nutrients your plants can absorb immediately.

We're proud to be American-made, organically certified, and family-operated. Whether you're growing tomatoes in a raised bed or managing a commercial farm, Wiggle Worm castings are the same product — pure, consistent, and proven over 45 years.

Improve Your Soil Today
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Organic soil solutions tailored for healthier plants richer soil, and sustainable gardening success.

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Over 40 years of experience producing premium organic fertilizers for healthier soil and sustainable plant growth.

Why Choose Us

Why Gardeners Trust Us

Premium organic fertilizer that strengthens roots, enriches soil naturally, and promotes healthier, vibrant plant growth safely.

100% Organic & Natural

Made from pure, chemical-free ingredients that naturally enrich soil and support healthy plant growth.

Odor-Free & Easy to Use

Completely odor-free formula designed for simple, clean, and hassle-free fertilizer application.

Safe for All Plants

Gentle yet powerful solution safe for vegetables, flowers, fruits, indoor plants, and lawns.
  • Step 01

    Feed at the Root Zone

    Dig your planting hole and add 1–2 handfuls directly where the roots will grow.

  • Step 02

    Water normally

    Water plants as usual to activate nutrients and support healthy plant growth.

  • Step 03

    Watch your plants thrive

    Enjoy stronger roots, greener leaves, and healthier plant growth naturally.

Our Solution

Tired of Weak Plants & Poor Soil?

Our premium worm castings naturally enrich soil, improve root strength, and increase yield without harmful chemicals.

Improve Your Soil Today

Problem

Weak Plant Growth
Soil Lacking Nutrients
Chemical Fertilizer Damage
Low Crop or Garden Yield

Solutions

Strengthen Plants With Natural Nutrients
Restore Soil
Safe Chemical-Free Plant Nutrition
Boost Roots And Crop Yield