Lava Rock (Coarse Grade)

For the largest aroids with thick, strong roots lava rock may be the appropriate choice for that super chunky substrate mix. Its porosity lends itself to well-draining mixes. Lava rock is also often used as drainage and/or as the sole substrate in terrariums where the plants don’t require a high level of nutrients. 

Lava rock is also great drainage material for vivariums. Lava rock is a great substrate that has a high surface area making it an ideal filter/drainage material that won't break down quickly. We recommend covering lava rock with a material such as horticultural fabric or synthetic screening to prevent smaller-grained substrate materials from filtering down into it.

Lava rock is also an excellent biological filter. The large surface area lends itself to a high volume of beneficial bacteria, Nitrosomonas and Nitrobactercomes, that will convert ammonia into nitrite and nitrite into nitrate respectively.

20-30mm Grade

As Stocked by the UK's Leading Brands

Our premium, peat free houseplant potting soils and substrates are stocked by the UK's leading plant shops, garden centres and plant brands, including:

  

Wholesale Customers

Interested in becoming a wholesale stockist? Our custom substrate range is available for wholesale customers in 2.5L and 8L for retail and also 40L sacks. For more information click here.

Recycling Scheme

All our substrates are now shipped in new resealable packaging. Once you've used the contents, simply post the bag back (or return in person) to us and we'll refill it for a 15% discount. Contact us for more information.