Know your amendments

Amendments are tools, not contestants in a cage match. Compost builds bulk organic matter, castings concentrate root-zone biology, mycorrhizae inoculate compatible roots, and mulch protects the surface.

Material Main job Where it goes
Compost Bulk organic matter Soil surface or upper layer
Castings Concentrated root-zone amendment Mixes, planting zone, top-dress
Mycorrhizae Specific fungal root partnership Direct contact with compatible roots
Mulch Surface protection On top, away from stems

Open the three comparison guides in the library for application rates, limits, and the occasional amendment pun. Spoiler: the winner is usually “use the right tool for the job.”


🌱 Keep growing

Three related guides worth reading next:


Keep Growing 🌱

Where to go next:

🪱 Your Soil Needs This

Reading about healthy soil is great. Growing in it is better. Our small-batch, traceable worm castings are the shortcut your garden deserves.

Shop Worm Castings Subscribe & Save

Every bag comes with a lot certificate. Know what's in your soil.