Organic Soil Amendments

49 products

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Build, Feed, and Re-Amend Your Soil

Dry organic fertilizers, mineral supplements, worm castings, guanos, and microbial inoculants from Gaia Green, Down To Earth, Roots Organics, FoxFarm, BuildASoil, Real Growers, and more. Whether you're top-dressing an existing soil, building a mix from scratch, or re-amending between cycles, use the guide below to find the right inputs.

What are you trying to do?

All-Purpose Feeding & Top-Dressing

Balanced dry fertilizers you mix into soil or top-dress every few weeks. Gaia Green 4-4-4 and Down To Earth 4-6-2 are the go-to options for veg. For bloom, switch to Gaia Green Power Bloom 2-8-4 or Roots Organics Uprising Bloom. The Gaia Green bundle covers both stages.

Single Ingredients & Targeted Inputs

Individual amendments for building custom mixes or correcting specific deficiencies. We carry bat guano, seabird guano, feather meal, bone meal, insect frass, rock dust, langbeinite, greensand, cal-mag, and more from Down To Earth, Roots Organics, and Gaia Green.

Microbial Life & Soil Biology

Real Growers Recharge is an instant microbial inoculant you mix into water. Wiggle Worm castings add biology and gentle nutrition. Both are good for new soil builds and mid-cycle top-dressing.

Programmed-Release & Low-Maintenance

Real Growers Grow Dots release nutrients on a timed schedule, so you water only and skip the feeding calendar entirely. Good for growers who want dry-amendment simplicity without the re-application.

Already growing in a living soil like KiS Organics or bio365? You may not need amendments at all for the first cycle. Check your soil's product page for re-amending guidance before buying inputs.