Comparison: Best Costco Organic Miracle Grow Potting Soil (Updated | Nov 11th)
If you’ve ever stood in the gardening aisle wondering which potting soil truly earns its stripes, you’re not alone. We’ve all seen the buzz around Costco’s organic Miracle-Gro—and for good reason. But does it live up to the hype when stacked against other top contenders? Whether you’re growing herbs on a windowsill or tomatoes in a backyard bed, let’s find out if this bulk favorite is your garden’s next miracle worker.
- Best for peat-free organic: Back to the Roots 100% Organic Potting Mix (Value 12 Quart) | Premium Blend | Made in The USA
- Best for 6-month feed: Miracle-Gro Potting Mix
- Best for big-box growth: Miracle-Gro 2 Pack Potting Soil Mix for Container Plants
- Best for indoor thrive: Miracle-Gro Houseplant Potting Mix: Fertilized
- Best for coco coir power: 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 all-purpose topsoil: Michigan Peat 40 Pound Bag Garden Magic Organic Planting Potting Top Soil Blend Mix for Indoor and Outdoor Gardening and Landscapes
- Best for mycorrhizae rich: Espoma Organic Potting Soil Mix – All Natural Potting Mix For All Indoor & Outdoor Containers Including Herbs & Vegetables. For Organic Gardening
- Best for premium indoor blend: Organic Potting Soil for Indoor Plants. Boost House Plant Growth for Monstera
- Best for fast-drain succulent: Miracle-Gro Cactus
- Best for raised bed ready: Espoma Organic Raised Bed Mix – All Natural and Organic Potting Soil Mix for Growing Vegetables and Herbs in Raised Garden Beds. for Organic Gardening.1.5 Cubic Foot Bag
Product Comparison: Best Costco Organic Miracle Grow Potting Soil
Back to the Roots 100% Organic Potting Mix (Value 12 Quart) | Premium Blend | Made in The USA
- 100% Organic and Peat-Free: Our potting mix is 100% organic and peat-free—made from upcycled plant matter and wood fines from across the U.S. No imported peat, just better soil with a lighter carbon footprint.
- All-Purpose: Our premium potting mix is versatile and well-suited for herbs, veggies, fruits, and flowers. It caters to all your gardening needs, and is proudly made in the USA.
- Better Moisture Control and pH Balance: Our premium soil blend incorporates yucca extract for moisture control and dolomitic limestone for pH balancing.
- 100% Satisfaction Guarantee: Not satisfied? Let us know. Our support team will get you growing with a replacement or refund—no questions asked.
- GROWONEGIVEONE — Share a photo of your growing garden and we’ll donate a Kids Grow Kit and STEM elementary school curriculum to a classroom of your choice.
Miracle-Gro Potting Mix, For Container Plants, Flowers, Vegetables, Annuals, Perennials, Shrubs, Feeds for up to 6 Months, 16. qt., 2-Pack
- Miracle-Gro Potting Mix feeds container plants for up to 6 months so you get more blooms for more color (vs. unfed plants)
- How to use: To use this potting medium, fill a container about 1/3 full with potting mix, place your plant in the soil, and fill the rest of the pot, pressing lightly
- What’s included: This bundles includes two 16 qt. bags of Miracle-Gro Potting Mix, each able to fill one 12-inch container (exact amounts may vary based on root ball size)
- Where to Use: Use this home gardening product with all types of container plants, including annual and perennial flowers, vegetables, herbs and shrubs
- This potting soil mix Grows Plants Twice As Big (vs. unfed plants)
Miracle-Gro 2 Pack Potting Soil Mix for Container Plants, Flowers, Vegetables, Shrubs, Annuals, and Perennials, Feeds for Up to 6 Months, 2 Cu Ft
- BIGGER PLANTS: Watch your container plants flourish with this potting soil that feed for up to 6 months to grow plants twice as big versus unfed plants
- VIBRANT COLORS: Get ready for a spectacular show of more blooms for more color versus unfed plants transforming your containers into dazzling displays
- WHERE TO USE: Perfect for all indoor or outdoor grown containers plants, including flowers, vegetables, herbs, and houseplants
- HOW TO USE: Pick a pot with drainage, fill it 1/3 full with this ready-to-use container mix, add your plant and fill in with more soil, then water; it’s that easy to create beautiful container gardens
- COVERAGE: Each 2 cu. ft. bag of Miracle-Gro Potting Mix fills two 14-inch containers (actual amount may vary depending on the size of the root ball)
Miracle-Gro Houseplant Potting Mix: Fertilized, Perlite Soil for Indoor Gardening, Designed to Be Less Prone to Gnats, 4 qt.
- Growing indoors is easy under the right conditions; Miracle-Gro Houseplant Potting Mix combines key elements plants need to thrive
- Recommended for growing beautiful indoor houseplant varieties like Pothos, Spider Plants, Monstera, Philodendron, English Ivy and more
- This indoor plant soil is less prone to gnats, thanks to the combination of perlite, sphagnum and peat moss that’s just right
- Certified by the Mulch & Soil Council as a quality product in compliance with industry standards
- A single 4-qt bag fills an 8-inch container; for even more spectacular results, start regular feedings with Miracle-Gro Plant Food 30 days after planting
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
- 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!
Michigan Peat 40 Pound Bag Garden Magic Organic Planting Potting Top Soil Blend Mix for Indoor and Outdoor Gardening and Landscapes, White
- Ready-to-Use for All Planting Needs: This general-purpose potting mix is ready to use out of the bag, making it perfect for both indoor and outdoor planting without any additional preparation
- Optimal Moisture Retention & Drainage: Designed to allow excess water to drain effectively while retaining moisture, promoting healthy plant growth during dry seasons
- High-Quality Soil Blend: Features a dark blend of reed sedge peat, perlite, and sand, offering the best conditions for plant health and soil structure
- Perfect for All Gardeners: Developed for both new and experienced home gardeners, this soil mix enhances plant growth in various environments and gardening projects
- Improves Soil Quality: Ideal for loosening heavy clay soils and enhancing moisture in light soils, making it perfect for use as a top dressing to fill holes in lawns and garden beds
Espoma Organic Potting Soil Mix – All Natural Potting Mix For All Indoor & Outdoor Containers Including Herbs & Vegetables. For Organic Gardening, 2 Cubic Foot bag. Pack of1
- FOR USE ON: Not just an indoor potting soil, this can also be used as a potting soil for outdoor plants and is a great soil mix for vegetables, herbs & all other container plants & flowers.
- CONTAINS: This organic soil for plants & vegetables is a rich blend of sphagnum peat moss, humus & perlite enriched with earthworm castings, alfalfa meal, kelp meal & feather meal
- MYCO-TONE: A proprietary blend of endo & ecto mycorrhizae.
- WHEN TO USE: Any time planting containers, whether starting a new plant or transplanting into a larger container. Plants require regular re-potting and fresh planting soil for optimum growth
- ORGANIC GARDENING: Contains a rich blend of only the finest natural ingredients. No synthetic plant foods or chemicals are used.
Organic Potting Soil for Indoor Plants. Boost House Plant Growth for Monstera, Fiddle Leaf, Money Tree, Pothos, Snake Plant, Aroid, Flowers, Herbs, Veggies, & More, Smart Grower 3 LB Ready to Plant
- Maximize Indoor Plant Growth Naturally– This premium organic indoor potting soil blend combines organic compost, peat, biochar, worm castings, and coco coir for a lightweight, nutrient-rich mix. Ideal for indoor herb gardens, vegetables, flowers, and house plants like Monstera, Snake Plants, and Money Trees.
- Save Time and Effort with Your Plants– No need for mixing or expanding soil—just open and plant! Smart Grower organic indoor potting soil provides a hassle-free, nutrient-packed living soil with superior drainage to prevent overwatering and root rot giving you a quick, no -fuss solution for happier indoor plants.
- USA Made, Cruelty-Free & Pet Safe – Feel good with organic indoor plant soil made in the USA without bone meal, fish byproducts, or animal-derived ingredients. This organic indoor plant soil is completely pet-safe, cruelty-free, and non-GMO—perfect for eco-conscious gardeners.
- Quickly Revive & Strengthen Indoor Plants – Supercharged with our root-enhancing blend of mycorrhizal fungi, sea kelp, molasses, yucca extract, Trichoderma, and beneficial Bacillus microbes to revive struggling plants, promote strong root growth, and maximize yields for your indoor plants.
- Made For Healthier Indoor Plants – Expertly designed for optimal indoor plant health, extended indoor plant life, and better yields for indoor vegetable plants, flowers and tropicals. Whether you need Monstera soil, Pothos soil, or an aroid potting mix, snake plant soil, fiddle leaf fig soil, tropical plant soil, this premium blend provides everything your houseplants need to thrive.
Miracle-Gro Cactus, Palm and Citrus Potting Mix, for Indoor or Outdoor Potted Plants, Great for Succulents, 8 qt., 2-Pack
- Miracle-Gro Cactus, Palm & Citrus Potting Mix features a fast-draining formula and is enriched with Miracle-Gro Plant Food
- This fast-draining formula is blended to help promote successful growing of cacti, potted palms, citrus, and other succulents
- This cactus potting mix is designed for indoor and outdoor container plants, including cacti, palm plants, citrus trees, and succulents
- To use this succulent soil mix, fill a pot with a drainage hole 1/3 full of mix, top with more mix after placing plant, and press lightly
- This bundle includes two 8 qt. bags of Miracle-Gro Cactus, Palm & Citrus Potting Mix, each able to fill two 8-inch containers (amounts may vary based on root ball size)
Espoma Organic Raised Bed Mix – All Natural and Organic Potting Soil Mix for Growing Vegetables and Herbs in Raised Garden Beds. for Organic Gardening.1.5 Cubic Foot Bag
- FOR USE: Ideal for raised garden beds and outdoor containers.
- CONTAINS: This organic soil mix for plants & vegetables is a rich blend of natural and organic ingredients enriched with earthworm castings, alfalfa meal, kelp meal & feather meal
- MYCO-TONE: A proprietary blend of endo & ecto mycorrhizae.
- WHEN TO USE: Use to fill new raised beds or to enhance soil in existing beds. Ready to use
- ORGANIC GARDENING: Contains a rich blend of only the finest natural ingredients. No synthetic plant foods or chemicals are used.
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
What should I consider when choosing between an organic potting mix and a conventional Miracle‑Gro blend?
Look at the source of nutrients: organic mixes rely on natural amendments like worm castings and kelp, while conventional blends contain synthetic fertilizers that feed plants for a set period. Also compare moisture‑control ingredients, such as yucca extract in Back to the Roots versus perlite in Miracle‑Gro, to see which matches your watering habits. Finally, factor in any preferences for peat‑free or pet‑safe formulations.
How does the nutrient longevity of Miracle‑Gro’s 6‑month feed compare to the steady release of organic soils?
Miracle‑Gro mixes are formulated to release nutrients for up to six months, giving a quick boost that can double plant size according to the label. Organic mixes like Wonder Soil or Espoma provide slower, continuous feeding from natural sources, which can lead to healthier root development over time. Your choice depends on whether you prefer a fast‑acting surge or a more gradual, sustainable supply.
Is the peat‑free claim of Back to the Roots significant for indoor gardening?
Yes, the peat‑free blend reduces carbon footprint and avoids the acidic conditions peat can create, making it gentler on indoor houseplants. It also includes yucca extract for better moisture regulation, which helps prevent over‑watering—a common issue with indoor containers. If you prioritize eco‑friendliness and a balanced pH, this mix is a strong contender.
Which product offers the best value per cubic foot for larger container projects?
Miracle‑Gro’s 2‑pack (2 cu ft total) fills two 14‑inch containers and is priced for bulk use, making it cost‑effective for big outdoor beds. Wonder Soil’s compressed coco‑coir expands four‑fold, giving you more volume for less storage space, which can also be economical. Compare the shelf price and the amount of usable soil each provides to decide which fits your project budget.
Can I use a single mix for both indoor houseplants and outdoor vegetables?
While many mixes are versatile, a truly all‑purpose option like Back to the Roots or Espoma’s Organic Potting Soil is designed for both indoor and outdoor use. However, mixes tailored for specific needs—such as Miracle‑Gro’s cactus, palm & citrus blend for succulents or the houseplant formula with perlite for better drainage—may yield better results when matched to plant type. Choose a general mix if you want simplicity, or a specialty blend for optimal performance.
What are the key differences in drainage and aeration among the listed soils?
Coco‑coir based Wonder Soil and Miracle‑Gro Houseplant mix both contain perlite, which improves aeration and prevents waterlogging. Back to the Roots uses wood fines and yucca extract for balanced moisture, while Espoma’s blend adds peat and perlite for a classic drainage profile. If your containers have limited drainage holes, prioritize a mix with higher perlite or coco‑coir content.
How important is the presence of mycorrhizal fungi in these potting soils?
Mycorrhizal fungi, found in products like Espoma and the premium organic blends, form symbiotic relationships with plant roots, enhancing nutrient uptake and stress tolerance. While not essential for all growers, they can boost growth especially in nutrient‑poor or confined containers. If you’re looking for an extra edge in plant vigor, selecting a soil with mycorrhizae adds measurable benefit.