Amazon.com : 2.7lb Horticultural Lava Rocks - Black Decorative Landscaping Pebbles,Pumice Potting Soil Amendment,Additive for Succulents,Cactus Bonsai,Crafts,Vase Fillers,Terrarium,Fairy Gardening ,Top Dressing : Patio, Lawn & Garden

【Ideal Drainage 】-- Faster Draining Blend, No Root Rot. Adding porous lava rocks instead of mulch to maintain plants such as orchids, succulents, cacti, and bonsai trees. The porosity of lava rocks allows for excellent drainage while maintaining moisture within soil.
【Potted soil additives】Pre-wash with no artificial fillers or colors. Lava Rock Soil Additive is used as a soil additive or top dressing in the art of bonsai.Lava Rock can improve water drainage, neutralize soil pH, and help plants grow better.
【Widely Usage】No Dyes or Chemicals , 100% Pure Volcanic Rock .Lava rocks can be used for top dressing of plants,Helps to maintain moisture, aerate soil, prevent erosion, and improve drainage. it can also be used to fill aquariums, ashtrays, fire media, garden soil amendments, and fire pits.
【DIY Material】These small horticultural lava rock are good for home decoration, craft projects,scene setting, fish tank, vase fillers,terrarium, fairy Gardening , flowerpot, succulent,cactus bonsai, houseplant, garden, outdoor decorative and more.
【Size】The 2.7lb lava stone is packed in a suitable size bag. You can take the portion you need and then seal it back for perfect prevention and storage. Due to transportation bump, it'll be some powder on surface. Before you first use, make sure to wash 2-3 times with water until their surface clean and smooth.