Comparison: Best Black Gold Potting Soil Ph (Updated | Nov 11th)

Choose a mix that includes a pH adjuster such as dolomite lime, which helps keep the soil slightly acidic to neutral. Look for blends that combine peat moss with perlite and pumice for good drainage, and ensure the product is OMRI listed if you prefer organic certification. The Sun Gro Black Gold African Violet Mix specifically mentions dolomite lime for pH control.

The African Violet Mix adds dolomite lime to adjust pH, whereas the standard All‑Organic mix focuses on a balanced nutrient profile without a specific pH modifier. The violet mix also contains earthworm castings and volcanic pumice, providing extra aeration for delicate houseplants. Both are OMRI listed, but the violet blend is tailored for acid‑loving plants.

Yes, the Seedling Mix is double‑screened Canadian sphagnum peat moss with fine ingredients that promote aeration and moisture retention, ideal for strong seedling development. It is OMRI listed, ensuring it meets organic standards for food‑grade production. However, you may want to supplement with a balanced fertilizer once seedlings have their first true leaves.

The SUNGRO Horticulture Black Gold 16‑Quart All Organic Potting Soil provides a larger volume per bag and is enriched with earthworm castings, perlite, pumice, and organic fertilizer, making it cost‑effective for bigger projects. Buying the 3‑pack of 16‑quart bags further reduces the per‑quart price. This mix is versatile for flowers, herbs, and vegetables.

All the listed Black Gold products are OMRI listed as organic, meaning they do not contain synthetic fertilizers. They rely on natural amendments such as earthworm castings, organic fertilizer blends, and mineral additives. This makes them suitable for growers who prefer organic gardening practices.

Perlite and volcanic pumice are the primary components that create air pockets and enhance drainage across the Black Gold line. These ingredients, combined with peat moss, help prevent waterlogging while retaining enough moisture for plant roots. The inclusion of earthworm castings also contributes to a light, friable texture.

Indoor mixes, like the African Violet and All‑Purpose potting soils, emphasize finer textures and pH adjustments for delicate foliage. Outdoor mixes often have higher organic matter and may include additional slow‑release fertilizers for robust growth. Checking the product description for intended use—such as “house plants” or “container‑grown flowers”—will guide you to the right choice.