Comparison: Best Miracle Gro Organic Potting Mix Costco (Updated | Nov 11th)
If you’re on the hunt for the best Miracle Gro organic potting mix at Costco, you’re not alone—gardeners everywhere are raving about its value and performance. In this honest comparison, we’ll dig into what makes this popular mix stand out, how it stacks up against other premium options, and whether the bulk buy truly saves you money in the long run. Spoiler: your tomatoes might thank you. Let’s break down the dirt—so you can grow smarter, not harder.
Miracle-Gro Performance Organics All Purpose Container Mix with Natural and Organic Ingredients
Organic Performance Mix
- Best for quick-release outdoor: Miracle-Gro Organic Outdoor Potting Mix
- Best for outdoor bulk pack: Miracle-Gro Organic Outdoor Potting Mix
- Best for large-volume outdoor: Miracle-Gro Organic Outdoor Potting Mix
- Best for water-guard indoor: Miracle-Gro Organic Indoor Potting Mix
- Best for indoor bulk pack: Miracle-Gro Organic Indoor Potting Mix
- Best for compact indoor pack: Miracle-Gro Organic Indoor Potting Mix
- Best for 6-month growth: Miracle-Gro Potting Mix
- Best for organic performance mix: Miracle-Gro Performance Organics All Purpose Container Mix with Natural and Organic Ingredients
- Best for gnat-resistant indoor: Miracle-Gro Indoor Potting Mix
- Best for peat-free organic: Back to the Roots 100% Organic Potting Mix (Value 12 Quart) | Premium Blend | Made in The USA
Product Comparison: Best Miracle Gro Organic Potting Mix Costco
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 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)
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 Organic Indoor Potting Mix, Protects Against Over and Under Watering, for Indoor Container Plants, Houseplants and Starter Plants, OMRI Listed, 16 qt.
- Miracle-Gro Organic Indoor Potting Mix protects indoor plants against over and under watering
- This organic container mix is made with responsibly sourced sphagnum peat moss (one hundred percent of peat sourced from certified producers), coir, and quick-start natural fertilizer
- Use this potting medium with all types of indoor container plants, including houseplants and herbs; also great for seed starting
- To plant seeds, fill container with potting mix, follow seed package planting directions, and water; To use with transplants, partially fill container, place plant after loosening the root ball, cover with more mix pressing lightly, and water
- One 16 qt. bag of Miracle-Gro Organic Indoor Potting Mix fills one 12-inch container (amounts may vary based on the size of the root ball)
Miracle-Gro Organic Indoor Potting Mix, Protects Against Over and Under Watering, for Indoor Container Plants, Houseplants and Starter Plants, OMRI Listed, 16 qt., 2-Pack
- Miracle-Gro Organic Indoor Potting Mix protects indoor plants against over and under watering
- This organic container mix is made with responsibly sourced sphagnum peat moss (one hundred percent of peat sourced from certified producers), coir, and quick-start natural fertilizer
- Use this potting medium with all types of indoor container plants, including houseplants and herbs; also great for seed starting
- To plant seeds, fill container with potting mix, follow seed package planting directions, and water; To use with transplants, partially fill container, place plant after loosening the root ball, cover with more mix pressing lightly, and water
- This bundle includes two 16 qt. bags of Miracle-Gro Organic Indoor Potting Mix; each bag fills one 12-inch container (amounts may vary based on the size of the root ball)
Miracle-Gro Organic Indoor Potting Mix, Protects Against Over and Under Watering, for Indoor Container Plants, Houseplants and Starter Plants, OMRI Listed, 8 qt., 2-Pack
- Miracle-Gro Organic Indoor Potting Mix protects indoor plants against over and under watering
- This organic container mix is made with responsibly sourced sphagnum peat moss (one hundred percent of peat sourced from certified producers), coir, and quick-start natural fertilizer
- Use this potting medium with all types of indoor container plants, including houseplants and herbs; also great for seed starting
- To plant seeds, fill container with potting mix, follow seed package planting directions, and water; To use with transplants, partially fill container, place plant after loosening the root ball, cover with more mix pressing lightly, and water
- This bundle includes two 8 qt. bags of Miracle-Gro Organic Indoor Potting Mix; each bag fills two 8-inch containers (amounts may vary based on the size of the root ball)
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 Performance Organics All Purpose Container Mix with Natural and Organic Ingredients, Feeds Container Grown Vegetables, Flowers and Herbs for up to 3 Months, 1 cu. ft.
- Organic Goodness: Grow vibrant flowers, herbs, and veggies with Miracle-Gro Performance Organics All Purpose Container Mix made with organic and natural ingredients, like aged compost, for the spectacular results you expect
- Bountiful Harvests: Get twice the bounty versus unfed plants for more container-grown vegetables, flowers, and herbs
- How to Use: Perfect for all your indoor and outdoor container gardening, simply fill your favorite pots with this potting soil and watch your flowers, vegetables, and herbs thrive
- Nourish: This premium organic container soil provides continuous plant nutrition for up to 3 months, helping your potted plants flourish
- Trusted Results: Grow confidently with this OMRI Listed container mix that gives you the Miracle-Gro results you love with the organic and natural ingredients you want
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)
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.
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 single 16‑qt bag and the 2‑bag bundles of Miracle‑Gro Organic Outdoor Potting Mix?
If you have just one or two containers, a single 16‑qt bag is enough and saves space. For larger gardens or multiple pots, the 2‑bag bundle offers better value per quart and reduces the number of trips to the store. Both options contain the same quick‑release natural fertilizer and responsibly sourced peat.
What are the main differences between the Outdoor and Indoor Organic Potting Mixes?
The Outdoor mix is formulated for garden containers and includes a peat‑based blend that feeds plants for up to two months. The Indoor mix adds coir and a moisture‑regulating blend to protect houseplants from over‑ and under‑watering. Choose Outdoor for flowers, veggies, and herbs outside, and Indoor for houseplants, seed starting, and indoor herbs.
Is the larger 25‑qt bag of Outdoor Potting Mix a better purchase than buying two 16‑qt bags?
The 25‑qt bag provides enough mix for about three 10‑inch containers, which can be more cost‑effective if you have a bigger planting area. Two 16‑qt bags give you flexibility to split the mix between separate projects or store one for later use. Compare the price per quart; the larger bag often has a lower unit cost.
How does Miracle‑Gro Performance Organics All‑Purpose Container Mix compare to the standard Organic Outdoor Mix?
Performance Organics uses aged compost and other organic ingredients, delivering continuous nutrition for up to three months, while the standard Outdoor mix relies on a quick‑release fertilizer that lasts about two months. Performance Organics is OMRI‑listed, appealing to gardeners seeking certified organic certification. Both are peat‑based, but Performance Organics may provide a longer feeding window for heavy‑feeding plants.
Can I use the Indoor Potting Mix for outdoor containers?
While the Indoor mix will work outdoors, it’s optimized for indoor environments with added coir for water retention and a formulation that reduces fungal gnats. Outdoor containers benefit from the faster‑acting fertilizer and peat composition of the Outdoor mix. For best results, match the mix to the growing conditions of your plants.
What should I look for in a value‑oriented potting mix like the Back to the Roots 12‑qt blend?
Back to the Roots offers a peat‑free, 100 % organic blend made from upcycled plant material, which reduces carbon footprint. It includes yucca extract for moisture control and dolomitic limestone for pH balance, making it versatile for herbs, veggies, and flowers. Compare its price per quart and the added sustainability benefits against Miracle‑Gro’s peat‑based options.
How do I calculate the amount of potting mix I need for my garden projects?
Measure the diameter and depth of each container, then use a simple volume formula (π × radius² × depth) to estimate the cubic inches needed. Convert cubic inches to quarts (1 qt ≈ 57.75 in³). This helps you decide whether a single bag, a bundle, or a larger bulk bag will cover your planting needs without waste.