Comparison: Best Potting Soil Worms (Updated | Nov 11th)
But not all worms are created equal. In this guide, we’ll dig into the **best potting soil worms** for your garden or potted plants, comparing their benefits, behavior, and why choosing the right one can make all the difference in growing healthier, happier greenery.
Editor’s Choice
Harris All Purpose Premium Potting Soil Mix with Worm Castings and Other Nutrients
Worm-Infused All-Purpose
Best for a specific purpose
- Best for worm-infused all-purpose: Harris All Purpose Premium Potting Soil Mix with Worm Castings and Other Nutrients
- Best for compressed coco boost: WONDER SOIL Organic Potting Soil | Ready to Plant Coco Coir Fully Loaded with Nutrients | 3 LBS Bag Expands to 12 Quarts of Indoor Outdoor Soil for Gardens & Plants | Incl Worm Castings
- Best for vegan worm castings: Worm Bliss (1 Qt) – Organic Worm Castings for Plants & Gardening – OMRI-Listed Earthworm Castings for Plants
- Best for 7‑in‑1 aroid blend: DUSPRO Recycle Pre-Mixed House Plant Soil Aroid Potting Mix 7-in-1 with Coco Coir
- Best for pure vermicompost: Back to the Roots Organic Worm Castings for Plants
- Best for 4× expandable supersoil: Compressed Organic Potting Soil for Garden
- Best for microbe‑rich organic: Brut Organic Potting Soil – 1CF
- Best for moisture‑retentive peat‑free: Organic Mechanics Premium Blend Potting Soil
- Best for family‑farm castings: Brut Organic Worm Castings for Plants 5 LB – Natural Nutrients
- Best for bulk organic nutrients: Brut Organic Worm Castings for Plants 30 LB – Natural Nutrients
Product Comparison: Best Potting Soil Worms
Worm-Infused All-Purpose
Harris All Purpose Premium Potting Soil Mix with Worm Castings and Other Nutrients, 4 Quarts
HARRIS
- All Purpose Potting Mix – Use indoors and outdoors for container gardening, flower boxes, hanging baskets and more
- Contains Worm Castings – A plant superfood, worm castings provide essential nutrients to plants including iron, sulfur, calcium, nitrogen, phosphorus and potassium
- Fast Drainage – Contains pumice and perlite to promote aeration of roots and fast drainage
- Formulated with Coco Coir – A sustainable resource that helps maintain moisture for vibrant flowers, vegetables and herbs
Compressed Coco Boost
WONDER SOIL Organic Potting Soil | Ready to Plant Coco Coir Fully Loaded with Nutrients | 3 LBS Bag Expands to 12 Quarts of Indoor Outdoor Soil for Gardens & Plants | Incl Worm Castings, Perlite
Wonder Soil
- NUTRIENT RICH & INDOOR/OUTDOOR FAST GERMINATION… Wonder Soil Premium Organic Potting Soil Mix is the only dry compressed coco coir mix with added amendments of worm castings, mycorrhizae, kelp, perlite and more! Grow your plants faster with stronger roots! Peat free, all natural, family and pet safe!
- A LITTLE DOES A LOT… your little BIG bag of compressed indoor potting soil & garden soil for outdoor plants expands to 4 TIMES THE SIZE when mixed with water; easy to carry & saves vital shed space.
- PRE-MIXED & READY TO USE ORGANIC POTTING MIX … Pre-mixed and ready to use organic potting soil and garden soil mix to help make your gardening or hobby growing a breeze. Simply transplant your desired plants into their new container and add our soil mix or pour our soil mix and plant your seeds.
- WATER RETENTION & DRAINAGE… Coco coir has excellent water retention with dependable drainage and aeration in the root zone. Save up to 50% of water, fertilizer, and seed!
- HEAVY DUTY RESEALABLE BAG… Use what you need and save the rest for later! Keeping your planting soil dry and safe!
Vegan Worm Castings
Worm Bliss (1 Qt) – Organic Worm Castings for Plants & Gardening – OMRI-Listed Earthworm Castings for Plants, Vegetables, Flowers, & Potting Soil – Organic Garden Fertilizer Rich in Nutrients
plantonix
- Organic Worm Castings for Garden Soil – Plantonix Worm Bliss is a 100% organic fertilizer and soil amendment that mixes with potting soil for indoor plants and outdoor plants. Worm castings are rich in essential nutrients like nitrogen, phosphorus, and potassium, as well as trace minerals that improve soil conditions for better overall plant mass.
- 100% Vegan & Manure-Free – We raise our worms in a climate controlled facility and feed them a strictly vegan diet. Our earth worm castings for plants are meticulously screened to get rid of any traces of dirt, sand, or rocks, leaving you with nothing but pure worm castings for plants, unlike others who dilute their castings with synthetic ingredients or additives.
- Supports Beneficial Microbial Activity – Using earthworm castings for plants encourages soil microbes that break down organic matter and convert nutrients into forms that plants can easily absorb. These microbes are crucial for increasing nutrient availability and building drought tolerance for a more balanced soil ecosystem.
- Excellent Water Retention – The humus in worm castings improves the soil’s ability to retain moisture, so you can rest assured knowing your plants are staying happy and hydrated. Worm humus for plants reduces the need for frequent watering, so you can save water and promote more sustainable gardening practices.
- Improves Soil Structure & Aeration – Using organic worm castings for plants increases the porosity of the soil, creating a well-oxygenated environment that supports efficient water and nutrient uptake. This makes earth worm castings organic fertilizer an excellent choice for plants, potting soil, potting mixes, garden containers, garden terraces, flowers, garden soil for vegetables, and more.
7‑in‑1 Aroid Blend
DUSPRO Recycle Pre-Mixed House Plant Soil Aroid Potting Mix 7-in-1 with Coco Coir, Peat Moss, Perlite, Worm Casting, Pumice, Pine Bark & Gypsum, Tropical Potting Mix for Indoor Plants, Herbs 2QRT
Duspro
- 🌱 Premium 7-in-1 Original Blend: DUSPRO house plant soil combines 7 premium ingredients: coco coir, peat moss, perlite, pumice, worm castings, pine bark, and gypsum. Developed based on expert recommendations from Vietnamese plant specialists, this special formula has been tested on diverse plant types. You won’t find this unique blend anywhere else.
- 🌱 Hand-Crafted Pre-Mixed Soil: Carefully blended by hand by skilled rural women in Vietnam, our potting mix ensures consistency and superior quality. Ready to use, saving your time and money compared to preparing it yourself. We provide convenient sizes available in 1 quart, 2 quarts, 4 quarts, 8 quarts and 20 quarts. 01 quart size is enough for 2 pots of 4”. Various sizes are perfect for small projects or larger gardening goals
- 🌱 Optimal Moisture Balance and Aeration: Coco coir and peat moss ensure excellent water retention, while pumice, perlite, and pine bark provide superior drainage and aeration. Our well draining potting soil prevents overwatering, keeps roots healthy, and allows them to breathe and expand freely.
- 🌱 Nutrient-Rich Plant Soil Indoor Potted Plants : Enriched with organic worm castings for essential nutrients and gypsum for minerals and pH balance, this potting mix supports robust root development, enhances soil structure, and promotes long-term plant vitality.
- 🌱 Versatile for Various Plants: DUSPRO chunky soil mix for indoor plants is ideal for aroid plants, flowers, climbing plants, and herbs, including pothos, philodendron, monstera, fiddle leaf fig, snake plant, african violet, peace lily, spider plant, dracaena, anthurium, ZZ plant, basil, mint, parsley, thyme, rosemary, oregano, cilantro, chives, dill, sage, tarragon, geraniums, petunias, marigolds, impatiens, begonias, zinnias, pansies, sunflowers, roses, snapdragons, daisies, and more.
- 🌱 Quality Commitment: DUSPRO house plant potting soil undergoes rigorous quality checks to meet the highest standards. If you’re not completely satisfied, reach out to our professional customer service team for a replacement or refund. Your satisfaction is our priority.
Pure Vermicompost
Back to the Roots Organic Worm Castings for Plants, Natural Fertilizer and Soil Enhancer for Gardening, Made in The USA, 5lb
Back to the Roots
- Earth Worm castings from Mother Earth provide the best soil amendment for anything indoors or outdoors, including vegetables, herbs, flowers and houseplants. Pure USA Vermicompost, so there’s no burn or odor.
- Contains beneficial microbes to enhance your soil and protect seedlings from harmful pathogens.
- Develop your garden more sustainably as worm castings reduce the need for fertilizers.
- 100% SATISFACTION GUARANTEE: If you are not satisfied or have any issues with this Organic Worm Castings, just shoot us a note and our dedicacted customer support team will make sure we get you growing or send you a refund/replacement.
- #GROWONEGIVEONE — share a photo of garden with #GrowOneGiveOne and we’ll donate an Organic Gardening Kit + STEM curriculum to an elementary school classroom of your choice!
4× Expandable Supersoil
Compressed Organic Potting Soil for Garden, Plants & Vegetables – Expands 4x When Mixed with Water – Indoor or Outdoor Use – Plant Food Mix Derived from Natural Coconut Coir & Worm Castings Fertilizer
Organic Plant Magic
- A LITTLE DOES A LOT – Easy to use compressed soil granules quickly expand up to 4X and make up to 3 gallons of soil. Light, compact, easy to carry, resealable bag saves space.
- NOURISH & SEE THEM FLOURISH – Packed with every essential nutrient plus 55+ trace minerals, this concentrated super soil feeds and grows strong beautiful vibrant plants better than ever!
- FAST ACTING & LONG LASTING – Easy to wet and stays moist 3X longer. Living soil gets water, air and nutrients to roots on demand. Perfect for all seeds, starts, transplants, containers, raised beds and gardens!
- TRULY ORGANIC YOU CAN TRUST – 100% natural ground coconut coir, worm castings, compost, humic acids, amino acids, kelp and beneficial GroBiotics including mycorrhizae give your soil, flower, vegetable, herb, fruit, tree, shrub, raised bed, outdoor or indoor potted house plants and more a super-boost.
- EASY to USE – Just add water 1:1 to compressed soil to expand up to 4X. Use 1 tsp for small seeds, 1 tbsp for large seeds, 1/4 cup per seedling, 1 cup per small plant, and 4 cups per gallon plant. Use expanded soil straight or blend 1:2 with other soil. Prevents overwatering, re-wets easily, and stays moist 3X longer. As mulch or top dress, apply 1/4 inch expanded soil or spread compressed soil and water. A 2 lb bag covers up to 20 sq ft.
Microbe‑Rich Organic
Brut Organic Potting Soil – 1CF, Premium Plant Soil with Organic Worm Castings, Trace Minerals & Perlite – Chemical-Free, Filler-Free – Ideal Potting Mix for Indoor & Outdoor Plants – 1pck
BRUT WORM FARMS
- NATURAL, ORGANIC INGREDIENTS: Made of 100% organic ingredients, this organic potting soil is free from synthetic fertilizers and chemicals. This planting soil gives your plants everything they need. Perfect for soil for indoor plants and outdoor potting soil.
- MICROBE-RICH SOIL: Packed with microbe-rich worm castings and trace minerals like Azomite and kelp, this organic soil feeds plants directly from the root level. Whether you’re growing vegetables, herbs, or flowers, Brut provides the nutrients they need.
- FOR ALL TYPES OF GARDENS: Brut Potting Soil is versatile, perfect as indoor plant soil. It works great for annuals, perennials, & herb plants. This all-purpose potting soil mix makes gardening easy for all plant types from indoor plants to outdoor gardens.
- PURE, FILLER-FREE: Say goodbye to the worry of unknown ingredients. It is pure and filler-free, with no sticks, wood chips, or artificial additives. Brut Organic Potting mix is naturally pH balanced between 6.3 and 6.5, making it perfect for most plants.
- CERTIFIED ORGANIC: Our Potting Soil is OMRI listed, representing true organic excellence and bringing the power of nature’s nutrients. Eco sustainable resorce for your gardening enjoyment!
Moisture‑Retentive Peat‑Free
Organic Mechanics Premium Blend Potting Soil, 8 qt – Moisture-Retentive, Peat-Free, Compost – Enriched Mix with Worm Castings & Perlite for Houseplants, Annuals, Veggies & Tropical Plants
Organic Mechanics
- Moisture-Retentive, Peat-Free Potting Soil – Retains moisture longer than peat-based soils, reducing watering frequency and promoting strong root development
- Ideal for Houseplants, Flowers, Annuals, and Tropicals – Perfect for small to mid sized containers, transplants, window boxes, small-space gardening, and for any plant that wants better moisture-retention
- Rich in Organic Matter for Healthy, Thriving Plants – Contains compost, aged pine bark, coconut coir, perlite, and worm castings. Encourages beneficial biology in the root zone for a happier, healthier plant!
- Harvest Twice as Much – Research trials show that this soil can produce up to twice the tomato yield compared to conventional potting soil
- Fertilizer-Friendly Blend – Combine with fertilizer at planting time for optimal plant performance, growth, and yield
Family‑Farm Castings
Brut Organic Worm Castings for Plants 5 LB – Natural Nutrients, Fertility Builder, Plant Food for Potting Soil and Garden Soil – Indoor and Outdoor Use
BRUT WORM FARMS
- SUPERCHARGE YOUR GARDEN: Elevate your plants’ growth with premium organic Brut Worm Castings. Our certified organic formula guarantees optimal nutrition for your indoor and outdoor plants.
- PURE ORGANIC GOODNESS: Made with certified organic ingredients, our worm castings are raised indoors in containers, ensuring unparalleled purity and effectiveness for your plants’ health.
- LUSH & VIBRANT PLANTS: Watch your plants thrive with mineral-rich Brut Worm Castings. Experience lush greenery, vibrant blooms, and bountiful harvests—naturally nourishing your plants from root to leaf.
- BORN FROM FAMILY CARE: As a family-owned business, we take pride in offering the finest organic castings. Every batch is carefully crafted to nurture your plants as if they were our own.
- CERTIFIED ORGANIC: Our castings are OMRI and CDFA listed, representing true organic excellence and bringing the power of nature’s nutrients directly to your plants’ roots. Eco sustainable resorce for your gardening enjoyment!
Bulk Organic Nutrients
Brut Organic Worm Castings for Plants 30 LB – Natural Nutrients, Fertility Builder, Plant Food for Potting Soil and Garden Soil – Indoor and Outdoor Use
BRUT WORM FARMS
- SUPERCHARGE YOUR GARDEN: Elevate your plants’ growth with premium organic Brut Worm Castings. Our certified organic formula guarantees optimal nutrition for your indoor and outdoor plants.
- PURE ORGANIC GOODNESS: Made with certified organic ingredients, our worm castings are raised indoors in containers, ensuring unparalleled purity and effectiveness for your plants’ health.
- LUSH & VIBRANT PLANTS: Watch your plants thrive with mineral-rich Brut Worm Castings. Experience lush greenery, vibrant blooms, and bountiful harvests—naturally nourishing your plants from root to leaf.
- BORN FROM FAMILY CARE: As a family-owned business, we take pride in offering the finest organic castings. Every batch is carefully crafted to nurture your plants as if they were our own.
- CERTIFIED ORGANIC: Our castings are OMRI and CDFA listed, representing true organic excellence and bringing the power of nature’s nutrients directly to your plants’ roots. Eco sustainable resorce for your gardening enjoyment!
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Buying Guide
FAQs
How do I choose between a pre‑mixed potting soil and a separate worm‑casting additive?
If you want a ready‑to‑use blend with balanced drainage, moisture retention, and nutrients, pre‑mixed options like Harris All Purpose Premium Potting Soil or DUSPRO’s 7‑in‑1 mix are convenient. Adding a pure worm‑casting product such as Back to the Roots or Brut Worm Castings gives you more control over nutrient density and can be mixed into any base soil. Consider your time, desired nutrient boost, and whether you prefer a single‑step product or a custom blend.
What are the benefits of coco coir versus peat in these mixes?
Coco coir, found in Wonder Soil, DUSPRO, and Organic Mechanics blends, retains water well while providing excellent aeration and is a sustainable, peat‑free alternative. Peat‑based mixes, like Harris, can hold more moisture but are less environmentally friendly and may require more frequent watering adjustments. Choose coco coir if you prioritize sustainability and consistent moisture, or peat if you need extra water holding capacity for very dry climates.
Which product offers the best value for large‑scale gardening?
For bulk applications, the compressed organic potting soil (B07DF9LN96) expands fourfold and covers up to 20 sq ft per 2 lb bag, making it cost‑effective for raised beds. Brut’s 30 lb worm‑casting bag also provides a high nutrient load at a lower per‑pound price for extensive outdoor beds. Compare the per‑pound cost and the amount of soil you need to fill your garden to determine the most economical choice.
How important is drainage and aeration, and which mixes excel at it?
Good drainage prevents root rot, while aeration supports healthy root growth; both are critical for most indoor and outdoor plants. Harris All Purpose and DUSPRO include pumice, perlite, and pine bark to boost aeration, whereas Wonder Soil and Organic Mechanics rely on perlite and coco coir for similar benefits. If you grow moisture‑sensitive plants like succulents, prioritize mixes with higher pumice or perlite content such as DUSPRO or Harris.
Are there any pet‑ or child‑safe options among these soils?
Wonder Soil advertises a pet‑ and family‑safe formula, and Back to the Roots emphasizes a non‑burn, odor‑free castings that are safe around children and animals. All‑organic blends like Brut and Organic Mechanics avoid synthetic chemicals, making them generally safer, but always check for any added fertilizers if you have sensitive pets. Look for certifications like OMRI listed to confirm organic, non‑toxic status.
How does the nutrient profile of organic worm castings compare across brands?
Back to the Roots and Worm Bliss provide 100 % pure worm castings with high levels of nitrogen, phosphorus, potassium, and trace minerals, while Brut’s castings are OMRI‑listed and include additional micronutrients from kelp and Azomite. The Worm Bliss product is vegan and manure‑free, appealing to those avoiding animal by‑products. Overall, all castings boost soil fertility, but Brut may offer a broader micronutrient spectrum due to its added organic amendments.
What storage tips help keep compressed or pre‑mixed soils fresh?
Store compressed soils like the 4‑X expanding mix in a resealable bag in a cool, dry place to prevent premature expansion or moisture loss. For pre‑mixed blends such as DUSPRO or Harris, keep the container tightly closed and avoid exposure to direct sunlight, which can dry out the organic matter. If you need to pause use for several months, consider adding a small amount of dry perlite to maintain aeration and prevent clumping.