Comparison: Best Pro Mix Premium Organic Soil (Updated | Nov 11th)

Look for a blend that includes Mycorrhizae or other beneficial microbes, as they improve nutrient uptake and stress resistance. Also consider the mix’s porosity and water-holding capacity, which affect root health and drainage. Finally, check for OMRI‑listed ingredients to ensure the product meets organic certification standards.

Both mixes are high‑porosity peat‑based blends, but the 3.8 CF Pro Mix MP includes Mycorrhizae and a stronger emphasis on air‑water balance for larger volumes. The 2.8 CF Pro Mix HP is geared toward water‑sensitive crops and low‑light conditions, offering slightly less volume at a lower price point. Choose the larger 3.8 CF if you need more material and want the added mycorrhizal boost.

Yes, it provides a 100 % organic, peat‑free formula made from upcycled plant material, which appeals to gardeners seeking a lower carbon footprint. While it lacks the explicit Mycorrhizae inoculation found in some Premier mixes, it includes yucca extract for moisture control and dolomitic limestone for pH balance. It’s a versatile all‑purpose blend suitable for herbs, vegetables, fruits, and flowers.

The Premier Horticulture 2 CF Pro Mix Ultimate All Purpose and the 1 CF Pro Ultimate Potting Mix both contain a slow‑release fertilizer that feeds plants for up to nine months. The 16‑Quart Organic Pro Seed Starting Mix also provides gradual feeding for about three months, making it better for short‑term seedling needs. For extended feeding, opt for the 2 CF or 1 CF mixes.

The Promix Premier Horticulture Organic Pro Seed Starting Mix (16 qt) comes with 20 pH test strips, helping you keep soil acidity within the optimal range for seed germination. None of the other listed mixes include built‑in pH testing accessories, so you would need to purchase a separate kit if precise monitoring is important to you.

MYCOACTIVE and Mycorise are formulations that introduce beneficial mycorrhizal fungi into the soil, which enhance root development and improve water and nutrient absorption. These additives also increase plant resistance to environmental stresses such as drought and disease. Mixes featuring these additives, like the Premier 1016041RGCE and the 3.8 CF Pro Mix HP Biofungicide, are especially useful for seedlings and sensitive crops.

Larger containers, such as the 3.8 CF (≈30 qt) mixes, generally provide a lower cost per cubic foot compared with 1 CF or 16‑Quart bags, making them more economical for bigger projects. Smaller packages, like the 1 CF Pro Ultimate Potting Mix, are better suited for hobbyists or limited‑space growers who don’t need bulk quantities. Consider the scale of your garden and how quickly you’ll use the soil to decide which size offers the best value.

Yes, the Premier Horticulture 1016041RGCE Organic Pro Seed Starting Mix and the Promix Organic Pro Seed Starting Mix (16 qt) are tailored for seed germination, featuring gentle nutrient release and mycorrhizal inoculation to support vigorous seedlings. The Pro Mix HP and Ultimate All Purpose mixes are more versatile, suitable for both seed starting and mature plant growth, but they contain higher levels of nutrients and drainage suited for established roots. Choose a seed‑starting mix for the earliest growth stages, then transition to a more robust blend as plants mature.