Crushed lava rock is a great soil substrate for bonsai, 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 for use in bonsai soil mix, it is also highly suitable for use in succulent and cacti soil mix.
Great for use as a soil additive or a top dressing.
Supplied black in colour, our crushed lava rock is pre-sieved to remove the very fine dust, it may however require further sieving at the time of use.
Imported from Japan, it has a grain size of between 2mm to 4mm and is supplied in 1 litre bags. Average weight is approximately 770g.For information on bonsai soil substrates and indicative mixes for your trees, take a look at our bonsai soil substrates article.