Comparison: Best G & B Organic Potting Soil (Updated | Nov 11th)

Look for a blend that balances moisture retention with good drainage, includes a pH‑neutralizing component, and contains beneficial microbes or mycorrhizae for root health. Indoor mixes should also be low‑odor and free of heavy peat to reduce the risk of mold and gnats. Products like Back to the Roots Indoor Potting Mix and Rosy Soil Indoor Potting Soil meet these criteria with yucca extract, dolomitic limestone, and added mycorrhizae.

Peat‑free mixes use upcycled plant material or coconut coir, which gives a lighter carbon footprint and often better aeration than traditional peat. Back to the Roots’ peat‑free formula also includes yucca extract for moisture control, while Miracle‑Gro relies on responsibly sourced peat that holds water longer but can be heavier and slower to dry. For gardeners prioritizing sustainability and quick drying, peat‑free options are usually the better choice.

For vegetable containers, look for mixes with a balanced fertilizer boost and sturdy structure; Miracle‑Gro Organic Outdoor Potting Mix and SunGro Black Gold provide quick‑release nutrients and perlite for aeration. Houseplant owners benefit from mixes that emphasize root development and pest resistance, such as Back to the Roots Indoor Potting Mix with mycorrhizae or Rosy Soil Indoor Potting Soil with biochar and pine bark fines.

Mycorrhizae form a symbiotic relationship with plant roots, improving nutrient uptake and drought tolerance, which can translate to faster growth and healthier foliage. Several products—including Back to the Roots Indoor Mix, Espoma Organic Potting Soil, and Rosy Soil—highlight their mycorrhizal content, making them a good value for gardeners seeking long‑term soil health. While not essential, these microbes give an edge over plain organic blends that lack biological inoculants.

A good potting mix will contain moisture‑regulating agents like yucca extract, coconut coir, or perlite, and a pH buffer such as dolomitic limestone. Back to the Roots mixes specifically list yucca extract for moisture control and limestone for pH balance, whereas Miracle‑Gro relies on peat’s natural water‑holding capacity but may need extra amendments to stabilize pH. Choose a mix that matches the watering habits of your plants to avoid over‑ or under‑watering.

Compressed soils like Wonder Soil and the Compressed Organic Potting Soil expand up to four times their volume, offering space‑saving storage and often a lower cost per expanded quart. They also pack a high concentration of nutrients and trace minerals, which can be more economical for large projects. However, they require water to activate, so if you prefer a ready‑to‑use product, traditional bags such as Back to the Roots may be more convenient.

Quick‑release fertilizers, like those in Miracle‑Gro Outdoor and Indoor mixes, provide an immediate nutrient boost that can last 1‑2 months, ideal for fast‑growing vegetables. Organic amendments such as worm castings, kelp, and mycorrhizae release nutrients slowly over time, supporting sustained growth for houseplants and perennial containers. Choosing between them depends on whether you need a rapid surge or a steady, long‑term feeding schedule.

While exact prices aren’t provided, bulk values such as the 12‑quart Back to the Roots packs typically offer a lower cost per quart than smaller 4‑quart packages like Rosy Soil Indoor Potting Soil. Compressed soils often claim higher coverage per bag, which can also reduce the per‑quart cost when expanded. Comparing the total volume you receive (including expansion) will give the clearest picture of value.