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

The 2CF All Purpose mix is formulated for a broad range of indoor and outdoor plants, offering a balanced blend suitable for most container gardening needs. The 1CF Vegetable & Herb mix is specifically tailored for edible crops, emphasizing nutrient ratios that support leaf and fruit production. Both contain a slow‑release fertilizer that feeds for up to nine months, but the vegetable mix often includes organic amendments that enhance flavor and nutrition.

For seed starting, the 1CF Pro Ultimate Potting Mix Loose is ideal because it is lightweight, sterile, and designed to promote rapid germination. It also includes a slow‑release fertilizer that provides gentle feeding without overwhelming delicate seedlings. This mix’s fine texture helps maintain consistent moisture, which is critical during the early growth stage.

Mycorrhizae form a symbiotic relationship with plant roots, extending the root’s ability to absorb water and nutrients, especially phosphorus. The 3.8CF Pro Mix MP’s mycorrhizal inoculation improves stress tolerance, leading to stronger, more resilient plants. This benefit is especially noticeable in organic crop production where synthetic inputs are limited.

Yes, the high‑porosity peat‑based blend creates excellent aeration and drainage, preventing water‑logged conditions that can harm sensitive roots. It is also well‑suited for low‑light environments and rooting cuttings because excess moisture quickly moves away from the root zone. Growers of orchids, ferns, and other moisture‑averse plants often prefer this mix.

Volume and plant density are the main factors: a 2CF mix provides more bulk, which is helpful for larger pots or multiple containers, while a 1CF mix is lighter and easier to handle for small indoor setups. Additionally, check the specific plant type—some indoor foliage benefits from the all‑purpose formulation, whereas herbs and vegetables may thrive better in the organic vegetable blend. Both options include a nine‑month slow‑release fertilizer, so feeding schedules remain similar.

The 3.8CF Pro Mix MP explicitly states that its ingredients are OMRI listed and approved for organic production. While the other organic mixes do not list OMRI status in the brief, Premier Horticulture typically sources OMRI‑certified components for their organic lines. It’s advisable to verify the certification label on the packaging if strict organic compliance is required.

All of the Premier Horticulture Pro Mixes contain a slow‑release fertilizer that provides nutrients for up to nine months, reducing the need for frequent supplemental feeding. This extended feeding window allows growers to focus on watering and light management rather than regular fertilization. However, for heavy‑feeding crops like tomatoes, a supplemental boost midway through the season can improve yields.

The 3.8CF Pro Mix MP provides a high volume of soil (3.8 cubic feet) at a competitive price, making it cost‑effective for extensive planting beds or multiple large containers. Its organic certification, mycorrhizal inoculation, and balanced air‑water ratio deliver strong performance without the need for additional amendments. For growers focused on pure organic certification, the 2CF Pro Mix Ultimate Organic Vegetable mix also offers good value, though in a smaller quantity.