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Help grow better : Natural black lava rocks contain trace minerals that plants need to grow and help them grow strong. Just place the lava rocks at the bottom of the pots so the water can pool without drowning the roots help plants grows better. Ideal drainage: Lava rocks are porous and will absorb and slowly release excess water back to the plant. Ideal for pots with no drainage holes. Ready to use: Top dressing for cacti succulents and other plants Provide nutrients for plants to grow better. Lava rocks with small size also can be used as a top dressing for your bonsai succulents and cacti etc. Multifunction: Black lava rocks not only used for plants decorative landscape garden patio ponds fish tank but also used for fire pit bowls gas logs fireplaces. Natural lava rock: Crushed lava rock ensures quick drainage while maintaining a little water and provides mineral supplements. The color is show different between dry and wet.