Optimize Organics&
Red lava rock held in a hand to show the size.
25L bag of Red Lava Rock – lightweight, porous volcanic rock for aeration, drainage, and moisture retention. Optimize Organics.

Red Lava Rock (9-15mm)

Regular price $11.00
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Size

Red Lava Rock (9–15mm)

Drainage • Aeration • Microbial Habitat

Red Lava Rock is a naturally porous volcanic stone formed during eruptions and colored by the oxidation of iron-rich minerals. This lightweight, mineral-rich amendment improves aeration, drainage, and soil structure, while providing surface area for beneficial microbes to thrive.

Its coarse texture and fast-draining properties make it an ideal addition to custom mixes for drought-tolerant plants or as a decorative, functional mulch to reduce evaporation.


🌿 Benefits

  • Improves airflow and drainage in soil

  • Helps prevent overwatering and root rot

  • Porous surface supports microbial activity

  • Can be used as mulch to reduce watering frequency

  • Natural and long-lasting—does not break down over time


🌱 Best Uses

  • Blend into soil mixes for succulents, cacti, bonsai, and coffee plants

  • Use as a mulch layer in containers or beds to retain moisture and suppress weeds

  • Ideal for raised beds, rocky landscapes, or desert-themed gardens


🧪 Specs

  • Size: 9–15mm (approx. 3/8"–1/2")

  • Material: Natural volcanic rock

  • Color: Deep red, iron-oxidized tone

  • Texture: Coarse, porous, and long-lasting


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