What Are the Dirt Tea Ingredients? All Six, Explained
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What's Actually in Dirt Tea? The Six Ingredients, Explained
Quick Answer: Every Dirt Tea bag contains six ingredients, each chosen for a specific role in soil health: worm castings (beneficial biology and slow-release nutrition), alfalfa meal (nitrogen and plant growth stimulants), kelp meal (trace minerals and root-supporting hormones), fish bone meal (phosphorus and calcium for fruiting and root strength), glacial rock dust (broad-spectrum trace mineral remineralization), and humic acid (nutrient retention and soil conditioning). Together they form a complete organic soil food designed to support the soil food web — not just plant nutrition. No fillers. No mystery ingredients. Just six things that work together.
If you've ever picked up a bag of soil amendment and flipped it over only to find an ingredient list that reads like a chemistry exam, you're not alone. Most gardeners want to know what they're putting in their soil — and why it matters.
Dirt Tea keeps it simple. Every 19g compostable bag contains six ingredients, each chosen because it does something real and specific for your soil ecosystem. No fillers. No mystery powders. Here's what's in every bag and what each one actually does.
You can browse the full product at dirttea.ca.
What Are the Six Dirt Tea Ingredients?
The six-pillar formula behind every Dirt Tea bag is: worm castings, alfalfa meal, kelp meal, fish bone meal, glacial rock dust, and humic acid. Together they work as a complete organic soil food — supporting microbial life, nutrient availability, and soil structure all at once.
Each ingredient has a specific role. None of them are there for show.
What Do Worm Castings Do for Your Soil?
Worm castings are the most biologically active ingredient in the formula. They're loaded with beneficial microbes, enzymes, and a slow-release form of plant-available nutrition that your soil can actually use.
Unlike synthetic inputs, worm castings feed the microbial life in your soil — the bacteria and fungi that make nutrients accessible to plant roots. Think of them as the living engine of the blend.
They also improve soil structure. Even in small amounts, worm castings help sandy soils hold moisture and compacted soils drain better. For a full breakdown, read our dedicated post on worm castings for plants.
What Does Alfalfa Meal Add?
Alfalfa meal is a natural source of nitrogen and a compound called triacontanol — a plant growth stimulant that occurs naturally in alfalfa. It breaks down relatively quickly compared to other organic inputs, making it useful early in the growing season when soil biology is waking up.
It also feeds soil microbes, contributing to the cycle of decomposition and nutrient release that healthy soil depends on.
Why Kelp Meal and What Does It Do in the Garden?
Kelp meal brings a wide spectrum of trace minerals and naturally occurring plant hormones called cytokinins. These compounds support root development and help plants respond to environmental stress more efficiently.
Kelp is not a major nutrient source on its own — it's more like a micronutrient and biological signalling layer. In a blended formula like Dirt Tea, it fills in gaps that single-ingredient amendments often miss.
What Is Fish Bone Meal and Why Is It in There?
Fish bone meal is a slow-release source of phosphorus and calcium. Phosphorus is critical for root establishment and early plant development, and calcium helps maintain soil structure and supports cell wall integrity in plants.
Because it releases slowly, fish bone meal works alongside the rest of the formula rather than spiking nutrient levels and then disappearing. It's especially useful in depleted or sandy soils that lack calcium.
What Is Glacial Rock Dust and Why Does It Matter?
Glacial rock dust is finely ground rock from glacially processed mineral deposits. It reintroduces trace minerals — silica, calcium, magnesium, iron, and dozens of others — that modern soils have lost through years of growing and harvesting.
It doesn't break down quickly. It integrates into the soil structure over time and slowly releases minerals as soil biology works on it. Think of it as the long game in the formula.
Plants grown in mineral-rich soil tend to be more structurally sound. Glacial rock dust is one of the most overlooked ingredients in organic soil care.
What Does Humic Acid Do?
Humic acid is a complex organic compound derived from decomposed organic matter. It acts as a soil conditioner — improving the ability of your soil to hold onto nutrients and make them available to plant roots.
It also supports microbial activity and helps break up compacted soil over time. In the context of a tea blend, humic acid works as a carrier and amplifier — helping the other five ingredients do their jobs more effectively.
If you want a deeper look at humic acid specifically, read our full post on what humic acid is and what it does for your soil.
How to Use Dirt Tea: Static Steep and Rip & Flip
Using Dirt Tea is straightforward. Drop one bag into a gallon of water, steep for 4 to 12 hours, and apply the liquid directly to your soil weekly. No aerator needed — this is a Static Steep method, designed for convenience.
After steeping, don't toss the bag. The Rip & Flip method turns spent tea bags into a zero-waste dry amendment. Tear the bag open and work the remaining material into the top inch of your soil. You're getting double value from every single bag — liquid organic soil food plus a slow-release top dressing.
You can order Dirt Tea and learn more about the method at dirttea.ca.
Conclusion
Every ingredient in Dirt Tea earns its place. Worm castings bring biology. Alfalfa brings nitrogen and growth factors. Kelp brings trace minerals and plant hormones. Fish bone meal brings phosphorus and calcium. Glacial rock dust remineralizes. Humic acid ties it all together and makes nutrients stick.
That's the whole formula — six ingredients, one goal: healthier soil.
Steep it weekly. Rip & Flip the bag when you're done. Feed your soil, not just the plant.
Be a Dirt Tea Gardener.
Frequently Asked Questions
What are the ingredients in Dirt Tea?
Every Dirt Tea bag contains six ingredients: worm castings, alfalfa meal, kelp meal, fish bone meal, glacial rock dust, and humic acid. Each one plays a specific role in feeding and supporting your soil ecosystem.
Are the ingredients in Dirt Tea organic?
Yes. All six ingredients in the Dirt Tea formula are naturally derived. The product is made in Ottawa, Ontario, Canada, by Dirt Tea, an Ottawa-based organic compost tea brand.
Is Dirt Tea a fertilizer?
Dirt Tea is an organic soil food, not a conventional fertilizer. Rather than delivering a concentrated dose of synthetic nutrients, it feeds and supports the microbial life in your soil so that your soil can make nutrients available naturally.
Can I use all six ingredients separately instead?
You could, but sourcing, measuring, and steeping six separate amendments takes time and storage space. The Dirt Tea formula is pre-blended in balanced ratios, ready to steep in minutes.
What does glacial rock dust do for plants specifically?
Glacial rock dust remineralizes soil with trace elements that get depleted over growing seasons. It doesn't act immediately — it integrates slowly and releases minerals over time as your soil biology breaks it down.
How does Dirt Tea compare to synthetic fertilizer?
Synthetic fertilizers deliver isolated nutrients directly to plant roots. Dirt Tea, as an organic soil food, delivers biology, trace minerals, and humic compounds to the soil ecosystem. The goal is different: instead of feeding the plant, you're feeding the community of organisms that feeds the plant. Over a full growing season, soil fed with a consistent organic soil food like Dirt Tea becomes progressively more capable of supporting plant health without synthetic inputs.
What is humic acid and why is it in Dirt Tea?
Humic acid is a naturally occurring organic compound that improves nutrient retention in soil and helps minerals become more bioavailable to plant roots. It also supports microbial life. In the Dirt Tea formula, it acts as a carrier and amplifier — making the other five ingredients more effective. Read more in our post on humic acid for soil.
Why does Dirt Tea use a tea bag format instead of granular amendments?
The tea bag format makes weekly application realistic. Steeping the six ingredients in water extracts water-soluble nutrients and biological compounds that penetrate the root zone immediately — faster than dry amendments worked into the soil surface. The Rip & Flip method then lets you use the spent solid material as a dry top dressing, giving you both liquid and slow-release benefits from one bag.