ProMix potting mixes typically include sphagnum peat moss (often Canadian sphagnum), coir/coco coir, perlite, and peat humus. Many formulas also contain amendments such as limestone and gypsum, plus wetting agents or a water-saving gel. Several mixes are enhanced with mycorrhizae and include slow‑release fertilizer. Exact ingredients vary by ProMix formula, so check the product label or details for a specific blend.

Many ProMix formulas are enhanced with mycorrhizal inoculants such as MycoActive (including Glomus intraradices). Product details state these additives are included to support stronger root development and improve water and nutrient uptake. Presence and specific strain names are listed on the product label or in the product description for each mix.

ProMix is sold in both loose‑fill bags and compressed bales. Product titles and bullet details typically indicate whether a specific item is 'Loose Fill' or a 'Compressed Bale,' so check the product listing or label to confirm format and capacity for the exact mix you want.

Some ProMix product descriptions explicitly list the origin (for example, one premium potting mix is labeled 'Made in the USA'), but origin details are not shown for every product in available listings. If country of manufacture is important to you, check the product page or the packaging for the specific mix before purchasing.

Common ProMix package sizes shown in product details include 8 quarts, 25.75 quarts (1 cu ft), 51.5 quarts (2 cu ft), and 97.7 quarts (3.8 cu ft). Available sizes can vary by specific ProMix formula, so check the product listing for the exact volume offered.

ProMix potting mixes are marketed as ready‑to‑use for indoor and outdoor container planting and are commonly used for seed starting, vegetables, herbs, transplants, greenhouse work, and early plant growth. Specific mixes are formulated for particular uses, so choose the ProMix product labeled for your intended application.