Comparison: Best Pro Mix Organic Soil (Updated | Nov 11th)
We’ve dug deep (literally) to compare the top contenders, testing for texture, nutrients, and real-world performance. Whether you’re growing veggies, flowers, or lush container plants, the right soil makes all the difference. Let’s break down what actually matters so you can skip the guesswork and give your plants the powerhouse foundation they deserve.
- Best for organic mycorrhiza boost: Premier Horticulture 3.8CF Pro Mix MP Mycorrhizae Organic
- Best for smart seed starter: Promix Premier Horticulture Organic Pro Seed Starting Mix; 16 qt with My Garden Pool PH Soil Test Strips 20 ct
- Best for three-month feed: Premier Horticulture 1016041RGCE Organic Pro Seed Starting Mix
- Best for 9-month all-purpose: Premier Horticulture Inc (1020030RG) 2CF Pro Mix Ultimate All Purpose Comp
- Best for peat-free blend: Back to the Roots 100% Organic Potting Mix (Value 12 Quart) | Premium Blend | Made in The USA
- Best for high drainage mix: PREMIER HORTICULTURE Inc 2038500RG 3.8CF Pro Mix HP Biofungicide and Mycorrhizae Soil-amendments
- Best for compact 9-month: Premier Horticulture 1010010RG 1CF Pro Ultimate Potting Mix Loose
- Best for water saver: Pro-Mix Potting 2CF
- Best for mycorrhiza generalist: Premier B10281RG Pro Mix Loose with Mycorrhizae
Product Comparison: Best Pro Mix Organic Soil
Premier Horticulture 3.8CF Pro Mix MP Mycorrhizae Organic
- Comes in 3.8 cuft container
- Specially designed to meet the needs of organic crop growers
- Provides superior overall growth, substantial crop yields, and plants that are better able to fight off environmental stresses
- Offers an excellent balance of air and water qualities for enhanced growth and survivability
- Ingredients are OMRI listed and approved
Promix Premier Horticulture Organic Pro Seed Starting Mix; 16 qt with My Garden Pool PH Soil Test Strips 20 ct, and Gardening Claw Gloves and Garden-IQ, Smart Gardening AI Assistant!
- 🌿Organic and All-Natural Ingredients: Carefully selected to provide your seeds with a healthy, chemical-free start.
- 🌱Enriched with Mycorrhizae: For enhanced nutrient and water absorption, promoting stronger root development and plant growth.
- 🧪Easy pH Monitoring: Comes with 20 pH soil test strips for optimal soil condition management.
- 🌻Versatile Use: Ideal for a wide range of plants, ensuring your garden’s diverse needs are met.
- 🌱Promotes Healthy Seeds: Specially formulated to encourage vigorous seed germination and growth.
- 🌿Eco-Friendly Packaging: Committed to sustainability, our packaging is designed to minimize environmental impact.
- 🧠 Garden-IQ, Smart Gardening AI Assistant: Get smart advice and solutions tailored to your gardening needs.
- 🧤Superior Gardening Claw Gloves: In addition to the fertilizer and pH test strips, this package also includes My Garden Pool Superior Gardening Claw Gloves, offering maximum protection and comfort for your hands while working in the garden.
Premier Horticulture 1016041RGCE Organic Pro Seed Starting Mix, 16 Quart
- Size : 16 Quart
- Ingredients : Organic Fertilizer
- Organic premium seed starting mix is ideal for perennials and flowering shrubs
- Contains an organic fertilizer that gradually feeds for up to 3 months
- Contains MYCOACTIVE to stimulate vigorous growth and greater resistance
Premier Horticulture Inc (1020030RG) 2CF Pro Mix Ultimate All Purpose Comp
- Formulated for a wide range of plant species
- Suitable for all indoor and outdoor planting applications
- Contains a slow release fertilizer that feeds for up to 9 months
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.
PREMIER HORTICULTURE Inc 2038500RG 3.8CF Pro Mix HP Biofungicide and Mycorrhizae Soil-amendments, 3.8 cu ft, Natural
- High porosity peat-based growing medium
- Ensures optimum growth, especially when high air capacity and extra drainage are required
- Contains Mycorrhizae, a beneficial endomycorrhizal fungus that increases resistance to stresses
Premier Horticulture 1010010RG 1CF Pro Ultimate Potting Mix Loose
- Ideal for all seed starting applications
- Suitable for potting and re-potting plants in containers
- Contains a slow release fertilizer that feeds for up to 9 months
Pro-Mix Potting 2CF, 2 Cubic ft, 2 Count (Pack of 1)
- Helps save on water
Premier B10281RG Pro Mix Loose with Mycorrhizae, 2.8 Cubic Feet
- pro mix bx mycorrhizae is a general purpose peat based professional growing media
- Designed for a wide range of greenhouse and transplanting applications that contains a mycorrhizal inoculum glomus intraradices
- It benefits the plant by increasing water and nutrients acquisition
- Symbiotic relationship between fungi and plant, results in an overall improved plant growth
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 prioritize when choosing an organic Pro‑Mix soil?
Look for OMRI‑listed ingredients, the presence of mycorrhizae, and a balanced air‑to‑water ratio. Size matters too—larger containers like the 3.8 cu ft options are cost‑effective for big projects, while 16‑qt bags suit seed‑starting or small containers. Also consider added benefits such as pH test strips or slow‑release fertilizers for longer feeding periods.
How does the Premier Horticulture 3.8 CF Pro Mix MP compare to the 2 CF Pro Mix Ultimate All‑Purpose?
The 3.8 CF Pro Mix MP offers a higher volume and includes mycorrhizae plus OMRI‑approved organic ingredients, making it ideal for larger greenhouse operations. The 2 CF Pro Mix Ultimate is formulated for a broader range of indoor and outdoor plants and provides a slow‑release fertilizer that lasts up to nine months, which can be more convenient for mixed‑use gardens.
Is the 16‑qt Promix Premier Organic Seed Starting Mix better than the Premier Horticulture 16‑qt Organic Pro Seed Starting Mix?
Both are 16‑qt organic mixes with mycorrhizae, but the Promix version includes a set of 20 pH test strips, helping you monitor soil acidity more precisely. The Premier Horticulture mix highlights a three‑month gradual‑feed organic fertilizer and the MYCOACTIVE component for stress resistance, which may give seedlings a stronger start in challenging conditions.
What are the advantages of a peat‑free option like Back to the Roots 12‑qt Potting Mix?
Back to the Roots uses upcycled plant material and wood fines, offering a lower carbon footprint compared with peat‑based mixes. It also incorporates yucca extract for moisture control and dolomitic limestone for pH balance, making it a versatile all‑purpose blend for herbs, vegetables, fruits, and flowers while staying fully organic.
Do I need a mix with a bio‑fungicide if I already have mycorrhizae?
A mix that includes both mycorrhizae and a bio‑fungicide, such as the Premier Horticulture 3.8 CF Pro Mix HP, provides dual protection: the mycorrhizae boost nutrient uptake, while the bio‑fungicide helps suppress soil‑borne pathogens. This combination can be especially valuable in high‑humidity environments where fungal issues are more common.
How long will the fertilizer in these mixes feed my plants?
Fertilizer longevity varies: the Premier Horticulture 2 CF Pro Mix Ultimate and the 1 CF Pro Ultimate Potting Mix both claim up to nine months of slow‑release feeding, while the 16‑qt Organic Pro Seed Starting Mix offers about three months of gradual feeding. Choose a mix with a longer feed period if you prefer less frequent repotting or fertilizing.
Which product gives the best value for large‑scale growers?
For volume and cost efficiency, the Premier Horticulture 3.8 CF Pro Mix MP is a strong contender, delivering a large amount of organic, mycorrhizae‑enhanced soil at a lower per‑cubic‑foot price. The 2.8 CF Pro Mix Loose with Mycorrhizae also offers good value for greenhouse transplanting, though its smaller size may require more frequent purchases for extensive operations.
Can I use these mixes interchangeably for indoor container gardening?
Yes, most of the listed mixes are suitable for indoor containers, but consider specific needs: the 1 CF Pro Ultimate Potting Mix is optimized for seed starting and repotting, while the 2 CF Pro Mix Ultimate provides a balanced medium for a wide variety of indoor plants. If you want extra moisture control and pH stability, the peat‑free Back to the Roots blend is an excellent indoor alternative.