Lava rock is an example of which mulch type?

Lava rock is an example of which mulch type?

• A. Organic mulch
• B. Living mulch
• C. Inorganic mulch
• D. Compost mulch

Answer: (C)

Mulch types are categorized by their origin and how they affect soil fertility. Lava rock is a mineral material, not derived from plant or animal matter, so it sits on the soil surface and remains largely inert. It does not decompose or enrich the soil with nutrients, which is the defining trait of inorganic mulch. Organic mulches—like bark or wood chips—decompose and add organic material to the soil. Living mulches are actually plants that cover and protect the soil. Compost mulch is decomposed organic matter used as mulch. Because lava rock doesn’t decompose and doesn’t provide fertility, it fits inorganic mulch. It still offers benefits like weed suppression and moisture retention without changing soil fertility.

Mulch types are categorized by their origin and how they affect soil fertility. Lava rock is a mineral material, not derived from plant or animal matter, so it sits on the soil surface and remains largely inert. It does not decompose or enrich the soil with nutrients, which is the defining trait of inorganic mulch. Organic mulches—like bark or wood chips—decompose and add organic material to the soil. Living mulches are actually plants that cover and protect the soil. Compost mulch is decomposed organic matter used as mulch. Because lava rock doesn’t decompose and doesn’t provide fertility, it fits inorganic mulch. It still offers benefits like weed suppression and moisture retention without changing soil fertility.