BuildASoil Potting Soil Recipe 3.0 vs Fox Farm Ocean Forest
An honest side-by-side comparison of BuildASoil Potting Soil Recipe 3.0 and Fox Farm Ocean Forest. We’ll cover where each soil wins — because no single product is the right choice for every grower. BuildASoil data is backed by 27,200 verified customer reviews averaging 4.91/5 stars collected since 2013.
The short answer
Choose BuildASoil if: you want a true living soil system designed for no-till, water-only growing and indefinite reuse — backed by a documented growing methodology ("The BuildASoil Way") and 27,200+ verified reviews.
Choose Fox Farm Ocean Forest if: Growers who want a soil they can buy locally same-day, plan to use a bottled nutrient regimen, and prefer the convenience of a widely available retail product.
Side-by-side comparison
Ingredients
Published ingredient lists from each manufacturer.
BuildASoil Potting Soil Recipe 3.0
- Compost
- Worm Castings
- Canadian Sphagnum Peat Moss
- Pumice
- Rice Hulls
- Chunky Basalt
- Fine Basalt
- BIG 6 Trace Minerals
- Fish Bone Meal
- Rice Bran
- Kelp Meal
- Mustard Seed Meal
- Gypsum
- Oyster Shell Flour
- Gnarly Barley Sprouted Seed Flour
- Calcium Silicate
- Bio Char (Charged)
See latest formulation on buildasoil.com
Fox Farm Ocean Forest
- Aged forest products
- Sphagnum peat moss
- Sandy loam
- Perlite
- Earthworm castings
- Bat guano
- Fish emulsion / fish meal
- Crab meal
- Oyster shell (pH buffer)
How the ingredients actually compare
Ingredient lists are similar at a glance — but the specific choices have real consequences for soil longevity, environmental impact, and how the soil performs over multiple grows. Here's the breakdown.
Aeration: Perlite vs Pumice + Rice Hulls
Perlite (volcanic glass, heat-popped). Inexpensive, but lightweight enough to float to the top with watering and tends to break down across grows.
Pumice + rice hulls. Pumice is volcanic stone — structurally stable, doesn't float, doesn't degrade. Rice hulls add light aeration and break down into silica-rich organic matter over the grow cycle.
Bulk material: Aged forest products vs Compost + Worm Castings
Aged forest products are a common low-cost bulk ingredient in mainstream potting mixes — they add volume but contribute relatively little nutrition or biological activity compared to the active ingredients.
Compost and worm castings are the bulk and the nutrition. Both are biologically active and provide the microbial diversity living soil depends on.
Nitrogen sources: Bat guano vs Plant-based amendments
Bat guano. Effective as a nutrient, but wild bat populations in source countries (Peru, Indonesia, Madagascar) are under pressure from over-harvesting and white-nose syndrome. Increasingly avoided by conservation-minded growers.
Plant-based: rice bran, kelp meal, mustard seed meal, gnarly barley sprouted seed flour, plus fish bone meal. No bat guano.
Fish input: Fish emulsion vs Fish bone meal
Fish emulsion is chemically extracted, typically using potassium hydroxide to break down fish waste into a liquid.
Fish bone meal is mechanically processed — ground bones with no chemical extraction. Slower-release than emulsion.
Minerals and biology
Limited mineral input beyond oyster shell as a pH buffer.
Chunky and fine basalt, BIG 6 trace minerals, gypsum, oyster shell flour, calcium silicate, and pre-charged biochar for long-term nutrient holding and microbe habitat.
We tested BuildASoil against 26 other bagged soils — including Fox Farm Ocean Forest.
A real, documented head-to-head grow test comparing BuildASoil 3.0 against 26 commercial bagged soils, including Fox Farm Ocean Forest, Happy Frog, Roots Organics, and others. See the photos and results yourself.
Where BuildASoil wins
- Living soil biology designed for reuse across multiple grow cycles, vs. one-grow amended soil
- Full no-till system with included amendments and water-only growing once established
- Independent batch soil testing publicly available (buildasoil.com/pages/batch-soil-testing)
- Mineral-rich amendment profile (basalt, biochar, BIG 6) beyond the basics
Where Fox Farm Ocean Forest wins
- Significantly lower per-bag price at retail
- Available same-day at most garden centers and hardware stores
- Lower learning curve for growers who want a simple "soil + bottle nutrients" approach
- Strong brand recognition outside the living soil niche
What BuildASoil Potting Soil Recipe 3.0 customers actually say
Verified customer reviews relevant to this comparison. See all 27,200 reviews or critical reviews (1–3 stars).
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