Comparison: Best Kellogg’S All Natural Garden Soil (Updated | Nov 11th)

Check the bag’s coverage guidelines; for example, a 16 qt. Miracle‑Gro Organic Outdoor Mix fills a 12‑inch pot, while a 25 qt. bag can fill three 10‑inch containers. Larger containers often benefit from mixes with added perlite or sand for better drainage. Matching the mix’s volume to your pot size helps avoid over‑ or under‑filling.

Miracle‑Gro’s formula includes a quick‑release natural fertilizer that feeds plants for up to two months, while Espoma focuses on a richer organic blend with earthworm castings, kelp, and feather meals. Espoma also adds a proprietary mycorrhizae blend (Myco‑Tone) for root symbiosis. Both are ready‑to‑use, but Espoma is marketed for raised beds and larger garden projects.

Peat‑free mixes, like Miracle‑Gro Organic Raised Bed & Garden Soil, use upcycled green waste instead of harvested peat, reducing habitat impact. They still provide excellent moisture retention and nutrient content, often with added coco coir or composted forest products. If sustainability is a priority, peat‑free options are a greener choice.

Mycorrhizae form a symbiotic relationship with plant roots, improving nutrient uptake and stress tolerance, which is highlighted in Espoma and Wonder Soil blends. Worm castings add beneficial microbes and a slow‑release source of nutrients, enhancing soil fertility over time. Including both can boost plant vigor, especially for vegetables and fruiting plants.

Miracle‑Gro Organic Outdoor Mix offers a bundle of two 16 qt. bags, covering two 12‑inch containers for a relatively low price per cubic foot. The LGM Soil All‑Purpose mix is sold in a smaller bag but is pre‑moistened, saving water and labor costs. Compare the total cubic footage you receive versus the price to determine the most economical option.

Yes, many of the mixes are versatile; LGM Soil All‑Purpose and Wonder Soil are formulated for both indoor and outdoor use. However, mixes with higher peat content, like Miracle‑Gro Outdoor, may retain more moisture, which can be beneficial for houseplants that prefer consistent humidity. Always ensure proper drainage when using outdoor mixes indoors.

Coco‑coir based mixes, such as Wonder Soil, excel at water retention while still providing good drainage, reducing watering frequency by up to 50 %. Peat‑rich blends like Miracle‑Gro retain moisture longer but may require careful watering to avoid soggy roots. Adding perlite or sand, as seen in Michigan Peat’s blend, improves drainage for plants that prefer drier conditions.

Choose a low‑pH formulation such as Coast of Maine Organic & Natural Planting Soil, which is specifically designed for acid‑loving species. These mixes contain ingredients that keep the soil slightly acidic and improve nutrient availability for plants like rhododendrons and blueberries. Pair the soil with regular pH testing to maintain optimal acidity levels.