Direct answer
The three core components are compost (nutrients), sand (drainage) and clay (water retention). Plants need different balances, which is why one mix never fits all.
| Component | Adds | Removes / trades | Source |
|---|---|---|---|
| Compost | Nutrients, NPK availability | — | Biomass / materials / shops |
| Sand | Drainage | Water retention | Materials / shops |
| Clay | Water retention | Drainage | Materials / shops |
Where components come from
Components are acquired through materials, biomass and club shops. See the materials hub for acquisition, and the biomass page for the main generator material.
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Evidence note
Component roles are official and observed. Per-plant ratios remain pending the Plant Info sweep.
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Component data is a shared record used by soil-mix, NPK and plant pages.