Comparison: Best Miracle Gro Potting Soil At Costco (Updated | Nov 11th)
But with so many options lining the warehouse shelves, how do you know which one’s truly worth your hard-earned cash? We’ve dug into the details—comparing ingredients, value, and real garden results—to help you pick the perfect bag. Whether you’re a seasoned green thumb or just starting out, this breakdown makes choosing the best Miracle-Gro mix easier than ever.
- Best for six-month boost: Miracle-Gro Potting Mix
- Best for eco outdoor blend: Miracle-Gro Organic Outdoor Potting Mix
- Best for moisture guard: Miracle-Gro Moisture Control Potting Mix
- Best for all-season moisture: Miracle-Gro Moisture Control Potting Mix for Outdoor and Indoor Plants
- Best for vibrant growth: Miracle-Gro Potting Mix
- Best for gnat-resistant indoor: Miracle-Gro Indoor Potting Mix
- Best for certified house mix: Miracle-Gro Houseplant Potting Mix – Fertilized Soil
- Best for compact house blend: Miracle-Gro Houseplant Potting Mix: Fertilized
- Best for big bloom bundle: Miracle-Gro 2 Pack Potting Soil Mix for Container Plants
- Best for organic outdoor bulk: Miracle-Gro Organic Outdoor Potting Mix
Product Comparison: Best Miracle Gro Potting Soil At 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 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 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 Houseplant Potting Mix – Fertilized Soil, Designed to be Less Prone to Gnats, 4 qt. (2-Pack)
- Growing indoors is easy under the right conditions; Miracle-Gro Houseplant Potting Mix combines key elements plants need to thrive
- This indoor plant soil is less prone to gnats thanks to the combination of perlite, sphagnum and peat moss
- Recommended for growing beautiful, indoor houseplant varieties like pothos, spider plants, monstera, philodendron, english ivy, and more
- Certified by the Mulch & Soil Council as in compliance with industry standards
- Bundle includes two bags of Miracle-Gro Houseplant Potting Mix
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 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 Organic Outdoor Potting Mix, for Outdoor Container Plants, Contains Quick-Release Natural Fertilizer, OMRI Listed, 16 qt., 2-Pack
- 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
- This bundle includes two 16 qt. bags of Miracle-Gro Organic Outdoor Potting Mix; each fills one 12-inch container (amounts may vary based on the size of the root ball)
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 decide between the regular Miracle‑Gro Potting Mix and the Organic Outdoor version?
The regular mix includes a synthetic, quick‑release fertilizer that feeds plants for up to six months, while the organic version uses a natural fertilizer that lasts about two months. If you prefer an all‑natural formulation and are planting outdoors, the organic mix is a good choice; for longer feeding periods and brighter blooms, the regular mix is more effective.
What are the benefits of the Moisture Control Potting Mix compared to the standard mix?
Moisture Control contains an AquaCoir formula that absorbs up to 33 % more water and helps prevent both over‑ and under‑watering, which is ideal for busy gardeners. It also feeds plants for six months and promotes growth similar to the regular mix, but adds the convenience of reduced watering frequency.
Is there a noticeable difference between the Indoor Potting Mix and the Houseplant Potting Mix?
Both are formulated for indoor use and claim reduced fungus gnat activity, but the Indoor mix emphasizes coconut coir for water retention, while the Houseplant mix relies on a blend of perlite, peat moss, and sphagnum for aeration. Choose the Indoor mix if you want extra moisture management; the Houseplant mix is a solid all‑round option for a variety of houseplants.
Which product gives the best value for large container gardens?
The 2‑pack 2 cu ft. Potting Mix (B0FCNYQLX8) provides the most soil per dollar and feeds plants for six months, making it ideal for filling multiple large containers. Its coverage of two 14‑inch pots per bag outweighs the smaller 8‑qt. bags when you have extensive garden beds.
Do the bag sizes affect how many plants I can fill, and how should I calculate coverage?
Yes, each product lists typical coverage: 16 qt. bags fill one 12‑inch pot, 8 qt. bags fill two 8‑inch pots, and the 2 cu ft. bag fills two 14‑inch pots. Multiply the number of bags by the stated coverage to estimate how many containers you can pot, adjusting for root‑ball size and pot depth.
Are there any special considerations for using Miracle‑Gro mixes in outdoor versus indoor containers?
Outdoor mixes, especially the Organic Outdoor version, are designed to handle temperature fluctuations and may include peat sourced responsibly for better drainage. Indoor mixes avoid materials that attract gnats and often contain coconut coir for consistent moisture, making them better suited for enclosed environments.
What should I look for in terms of fertilizer longevity when comparing these mixes?
The regular Potting Mix and Moisture Control formulas provide up to six months of feeding, while the Organic Outdoor mix offers about two months of natural fertilizer release. If you prefer less frequent feeding, opt for the six‑month formulas; otherwise, the organic option may be sufficient for seasonal planting.