Comparison: Best Miracle Gro Potting Mix At Costco (Updated | Nov 11th)
But with so many options lining the warehouse shelves, how do you know which one’s truly worth it? We’ve dug into the details—ingredients, value, performance—to help you choose the right blend for your indoor greens, outdoor containers, or garden beds. Spoiler: not all Miracle-Gro mixes are created equal. Let’s break down the top picks so you can grow with confidence and save money at the same time.
- Best for big growth mix: Miracle-Gro Potting Mix
- Best for organic quick‑feed: Miracle-Gro Organic Outdoor Potting Mix
- Best for all‑season feed: Miracle-Gro Potting Mix
- Best for moisture control mix: Miracle-Gro Moisture Control Potting Mix
- Best for gnat‑resistant indoor: Miracle-Gro Indoor Potting Mix
- Best for perlite house mix: Miracle-Gro Houseplant Potting Mix: Fertilized
- Best for all‑season moisture: Miracle-Gro Moisture Control Potting Mix for Outdoor and Indoor Plants
- Best for bulk organic mix: Miracle-Gro Organic Outdoor Potting Mix
- Best for gnat‑resistant house: Miracle-Gro Houseplant Potting Mix – Fertilized Soil
- Best for fast‑drain succulent: Miracle-Gro Cactus
Product Comparison: Best Miracle Gro Potting Mix 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 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 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 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, 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 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 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 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)
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 are the main differences between the standard Miracle-Gro Potting Mix and the Organic Outdoor version?
The standard mix includes a synthetic, quick‑release fertilizer that feeds plants for up to six months, while the Organic Outdoor mix uses a natural fertilizer that lasts about two months. The organic blend is made with responsibly sourced peat and is certified organic, appealing to gardeners who prefer natural inputs. Both are designed for container plants, but the organic option is specifically marketed for outdoor use.
How does the Moisture Control Potting Mix protect against over‑ and under‑watering?
Moisture Control contains an AquaCoir formula that absorbs up to 33% more water than basic soils, helping maintain consistent moisture levels. The blend also includes a wetting agent and coir, which release water slowly to prevent the roots from drying out or becoming water‑logged. This makes it a good choice for gardeners who want a more hands‑off watering routine.
Which mix is best for indoor houseplants and why?
The Indoor Potting Mix is formulated for houseplants, featuring coconut coir for water retention and a low‑gnat composition that omits compost and bark. It feeds plants for up to six months and includes two 16‑qt. bags that can each fill a 12‑inch pot. For those who want an even more specialized blend, the Houseplant Potting Mix adds perlite and sphagnum moss for extra aeration.
Is the Cactus, Palm & Citrus mix suitable for regular garden vegetables?
The Cactus, Palm & Citrus mix is a fast‑draining formula enriched with plant food, optimized for succulents, palms, and citrus trees. Its high drainage may not retain enough moisture for most vegetable crops, which generally prefer a richer, moisture‑retentive medium. For vegetable gardening, a standard or indoor mix with more nutrient content is usually a better fit.
How do the bag sizes and coverage compare across the different mixes?
Bag sizes range from 4‑qt. (Houseplant Mix) to 25‑qt. (Organic Outdoor). Typically, a 16‑qt. bag fills one 12‑inch container, an 8‑qt. bag fills two 8‑inch pots, and the 25‑qt. bag can fill three 10‑inch containers. Understanding the coverage helps you estimate how many containers you can pot with a single purchase.
What should I consider regarding fertilizer duration when choosing a mix?
If you prefer less frequent feeding, choose a mix with a longer‑lasting fertilizer, such as the standard or Indoor Potting Mix that feeds for up to six months. The Organic Outdoor mix provides a quicker release that lasts about two months, meaning you’ll need to re‑fertilize sooner. Match the fertilizer duration to how often you plan to tend to your plants.
Are there any mixes that help reduce fungus gnats?
Both the Indoor Potting Mix and the Houseplant Potting Mix are designed to be less prone to gnats by avoiding compost or bark, which are common gnats habitats. The Indoor mix also uses coconut coir, which further discourages gnat breeding. Choosing these mixes can lessen the need for additional pest control measures.
How does price‑to‑value compare for the bundles offered at Costco?
Costco typically sells the standard and Moisture Control mixes in two‑bag bundles (16‑qt. each), offering good value for larger container projects. The Organic Outdoor mix is sold in single 16‑qt. or larger 25‑qt. bags, which may be pricier per quart but provide an organic option. Evaluating the amount of soil needed for your garden and the added features like moisture control or organic certification will help determine the best value.