Crushed lava rock is great for providing both drainage as well as some moisture retention. It is ph neutral and makes a great additive in many soil mixtures and helps promote root growth.
Supplied black in colour, uur crushed lava rock is pre-sieved to remove the very fine dust. Great for use as a soil additive or a top dressing.
Imported from Japan, it has a grain size of 2mm to 4mm and is supplied in 1 litre bags. Average weight is approximately 770g.