Porous Black Horticultural Lava Rocks, for terrarium drainage control, the bottom layer of the moss terrarium
- These are small black lava rockes. Small lava rockes are porous, great to let water go thru and function as filter. They are one of the best rock to grow moss, easy to use.
There are two size options: 1-3mm, 5-8mm.
The 5-8mm is used as the bottom layer of a terrarium, to prevent waterlog. Above the lava layer, there are sphagna layer and soil.
With those small lava rocks layers at bottom of the glass terrarium, you will see immediately if you over water your plants. It allows you pour out the extra water easily. putting in small lava rockes is the beginning steps of almost every moss terrarium and succulents terrariums I made.
The 1-3mm smaller size usually functions as decorative rock in the water. It has a suitable size to make your waterpond decent.
In my waterpond terrariums, I put the 1-3mm lava rockes at bottom to let the large rockes stand stable and adjust its position.
There are two color options: red lava and black lava. This is the black one, there is a red one in my shop too.
Ideal for plants like orchids, succulents, cacti, and bonsai trees
Size: 1-3mm, 5-8mm
Weight: 700g/ 1.54lb
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