Vermiculite

Vermiculite is a lightweight, heat-expanded mineral that is prized for its ability to improve soil by retaining moisture and nutrients, while also providing aeration for plant roots. Its sponge-like structure absorbs water and releases it slowly to plants, and its neutral pH and high cation exchange capacity (CEC) prevent nutrients from leaching away. This makes it useful for seed starting, rooting cuttings, soil conditioning, and providing a more consistent growing environment for various plants.