Comparison: Best Potting Soil Miracle Gro Costco (Updated | Nov 11th)
We’ve dug into the bags, compared ingredients, price points, and real garden results to help you decide. Whether you’re repotting houseplants or starting a garden, we’ll break down what makes each option shine—so you can grow with confidence and get the most bang for your buck.
- Best for long-lasting growth: Miracle-Gro Potting Mix
- Best for organic quick feed: Miracle-Gro Organic Outdoor Potting Mix
- Best for moisture control: Miracle-Gro Moisture Control Potting Mix
- Best for versatile potting: Miracle-Gro Potting Mix
- Best for gnat-resistant indoor: Miracle-Gro Indoor Potting Mix
- Best for premium aquacoir: Miracle-Gro Moisture Control Potting Mix for Outdoor and Indoor Plants
- Best for bulk organic: Miracle-Gro Organic Outdoor Potting Mix
- Best for cactus palm mix: Miracle-Gro Cactus
- Best for houseplant perlite: Miracle-Gro Houseplant Potting Mix: Fertilized
- Best for seed starter: Miracle-Gro Seed Starting Potting Mix
Product Comparison: Best Potting Soil Miracle Gro Costco
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 Organic Outdoor Potting Mix, for Outdoor Container Plants, Contains Quick-Release Natural Fertilizer, OMRI Listed, 16 qt.
- Miracle-Gro Organic Outdoor Potting Mix contains a quick-release natural fertilizer and also feeds plants for up to 2 months
- This potting mix is made with responsibly sourced peat (one hundred percent of peat sourced from certified producers)
- Use this organic potting mix with all types of outdoor container plants, including flowers, vegetables, herbs, annuals, and perennials
- To plant in pots, fill the container partially full with potting mix, place the plant in the pot after loosening the root ball, cover with more mix and water thoroughly
- One 16 qt. bag of Miracle-Gro Organic Outdoor Potting Mix fills one 12-inch container (amounts may vary based on the size of the root ball)
Miracle-Gro Moisture Control Potting Mix, For Container Plants, Protects against Over- and Under-Watering, 8 qt., 2-Pack
- Miracle-Gro Moisture Control Potting Mix feeds plants for up to 6 months and Grows Plants Twice As Big! (vs unfed plants)
- This potting medium protects against over and under watering; also absorbs up to 33% more water than basic potting soil* with exclusive AquaCoir Formula (*soil that does not contain sphagnum peat moss, coir, and wetting agent)
- Use this gardening product with all types of container plants, including flowers, vegetables, annuals, perennials, and shrubs
- To use this potting soil, fill a container about 1/3 full with potting mix; place your plant in the pot and cover with more mix
- This bundle comes with two 8 qt. bags of Miracle-Gro Moisture Control Potting Mix; each fills two 8-inch containers (exact amounts may vary depending on the size of the root ball)
Miracle-Gro Potting Mix, For Indoor or Outdoor Potted Plants, Flowers, Vegetables, Shrubs, Annuals, and Perennials, Feeds Up to 6 Months, 8 qt.
- Feeds all potted plants: Miracle-Gro Potting Mix feeds all types of potted plants, including flowers, vegetables, shrubs, annuals, and perennials for up to 6 months
- Promotes growth: This potting soil Grows Plants Twice As Big! (vs. unfed plants)
- Boosts color: Get more blooms for more color (vs unfed plants)
- Application: To apply 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; water thoroughly
- Coverage: Each 8 qt. bag of Miracle-Gro Potting Mix fills two 8 inch containers (exact amounts may vary depending on the size of the root ball)
Miracle-Gro Indoor Potting Mix, Blended for a Variety of Houseplants, Feeds for up to 6 Months, 16 qt., 2-Pack
- Miracle-Gro Indoor Potting Mix feeds houseplants for up to 6 months and is designed to be less prone to gnats (contains no compost or bark, which are known to shelter fungus gnats)
- This potting mix contains coconut coir, which holds and releases water and helps soil re-wet
- Where to use: Blended for a wide variety of indoor container plants, including climbing, foliage, flowering, and tropical plants
- How to use: To use, fill a container about 1/3 full with potting mix; add more mix after placing your plant in the pot
- What’s included: This bundles includes two 16 qt. bags of Miracle-Gro Indoor Potting Mix, each able to fill one 12-inch containers (exact amount may vary based on the root ball size)
Miracle-Gro Moisture Control Potting Mix for Outdoor and Indoor Plants, 1 cu. ft. 2-pack
- Protects against over- and under-watering
- Feeds up to 6 months
- Grows Plants Twice as Big! *vs. unfed plants
- Absorbs up to 33% more water than basic potting soil* *vs. potting soil that does not contain sphagnum peat moss, coir and wetting agent
- Helps beautify potted flowers, indoors and out
Miracle-Gro Organic Outdoor Potting Mix, for Outdoor Container Plants, Contains Quick-Release Natural Fertilizer, OMRI Listed, 25 qt.
- Miracle-Gro Organic Outdoor Potting Mix contains a quick-release natural fertilizer and also feeds plants for up to 2 months
- This potting mix is made with responsibly sourced peat (one hundred percent of peat sourced from certified producers)
- Use this organic potting mix with all types of outdoor container plants, including flowers, vegetables, herbs, annuals, and perennials
- To plant in pots, fill the container partially full with potting mix, place the plant in the pot after loosening the root ball, cover with more mix and water thoroughly
- One 25 qt. bag of Miracle-Gro Organic Outdoor Potting Mix fills three 10-inch containers (amount may vary based on the size of the root ball)
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)
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
Miracle-Gro Seed Starting Potting Mix, 8 Quarts (Pack of 2), For Use in Containers
- Specially formulated for fast root development
- Enriched with Miracle-Gro Plant Food
- Excellent for starting cuttings
- Use when starting from seed and with leaf, stem or root cuttings
- This bundle includes two 8 qt. bags of Miracle-Gro Seed Starting Potting Mix
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 a Miracle‑Gro potting mix for my container garden?
Look at the intended plant type (indoor houseplants, outdoor vegetables, succulents, or a mix) and the moisture control features each blend offers. Check the fertilizer duration—some mixes feed for up to six months, while others provide a shorter two‑month boost. Also compare bag sizes and coverage to ensure you get the right amount of soil for the number and size of containers you plan to fill.
How does the standard Miracle‑Gro Potting Mix differ from the Organic Outdoor version?
The standard mix contains a synthetic, quick‑release fertilizer that feeds plants for up to six months and promotes growth twice as large as unfed plants. The Organic Outdoor mix uses a natural, quick‑release fertilizer with a two‑month feeding window and is made with responsibly sourced peat. Choose the organic option if you prefer a more environmentally friendly formula, especially for outdoor containers.
Is the Moisture Control Potting Mix worth the extra cost for indoor and outdoor use?
Moisture Control adds an AquaCoir formula that absorbs up to 33 % more water and helps prevent over‑ or under‑watering, which can be valuable for beginners or drought‑prone areas. It also feeds plants for six months and claims to double plant size, similar to the regular mix. If you struggle with watering consistency, the added technology can save time and reduce plant stress, making the higher price justified.
Which mix is best for preventing fungus gnats on houseplants?
The Indoor Potting Mix is formulated without compost or bark, which are common habitats for fungus gnats, and includes coconut coir for better water management. This blend feeds for six months while minimizing gnat problems. For sensitive indoor collections, it provides a cleaner growing medium compared with standard mixes.
How do the bag sizes and container coverage compare across the different mixes?
Standard and Indoor mixes come in 16‑qt bags that each fill one 12‑inch container, while the Moisture Control 8‑qt bags fill two 8‑inch containers. The Organic Outdoor mix is available in 16‑qt and larger 25‑qt bags, with the 25‑qt covering roughly three 10‑inch pots. Understanding these ratios helps you calculate total soil needed and avoid buying excess product.
Can I use the Cactus, Palm & Citrus Mix for regular garden vegetables?
The Cactus, Palm & Citrus blend is a fast‑draining formula designed for succulents and citrus, which prefer drier conditions. Using it for vegetables that need consistent moisture may lead to poor growth. For edible plants, a standard or organic potting mix with balanced water retention is a safer choice.
What value does the Seed Starting Potting Mix provide for new gardeners?
This mix is specially formulated for rapid root development and includes extra plant food to support seedlings and cuttings. It comes in a pack of two 8‑qt bags, offering enough medium for multiple seed trays. Its focused nutrients can give germinating seeds a stronger start than a generic potting soil.
How do I decide between buying a single large bag versus a bundle of smaller bags?
Large bags (e.g., 25 qt) often have a lower cost per quart and are ideal if you have many or large containers to fill. Bundles of smaller bags give flexibility to store and use soil in stages, reducing waste if you only need a few pots initially. Consider your planting schedule, storage space, and budget when making the choice.