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New Pumice 25 Litres View larger

$11.00

Horticultural Pumice 5 Litres

ONLINE ONLY. Pumice is a light siliceous vesicular volcanic rock that is suitable for use in horticulture and hydroponics. Pumice is a popular growing medium for Cacti, Succulents, Orchids, Bonsai and many others. Its porosity provides air spaces that maintain aerobic conditions around the roots while water is contained within the pores.

Pumice 5 Litres.

Pumice is a light siliceous vesicular volcanic rock that is suitable for use in horticulture and hydroponics. Its porosity provides air spaces that maintain aerobic conditions around the roots while water is contained within the pores. Surface tension around the outside of the pumice particles increases water-holding capacity of the growing medium.  Pumice is a popular growing medium for Cacti, Succulents, Bonsai, Orchids and many other plants.

Our pumice is mined from a land-based resource, within 50kms of Lake Taupo in the North Island of New Zealand, and it is characterized by its relative hardness and lightweight in comparison to competing aggregates. The washing and screening of our pumice particularly for horticultural applications means that no ‘fine’ particles are included. Unwashed pumice can cause ‘concreting’ and higher water holding capacity than required, consequently affecting root development.

This hardness and porosity allows free drainage lowering the risk of root-rot diseases.

Pumice grades supplied for horticultural uses include:

  • 1-4mm (Available in 5L)
  • 1-7mm (Only in 25L, see below)
  • 4-20mm (Only in 25L, see below)
  • 7-20mm (Only in 25L, see below)

Frequently Asked Questions

Q. Which pumice grade is best for growing Succulents?

A. According to the manufacturer, they suggest using mostly 1-4mm with a little 4-10 mixed though. The pumice should also be mixed with 50 to 75% of fine to medium organic matter like compost and garden soil.

Q. What is the PH of this pumice?

A. According to the manufacturer "The pH of Pumice is typically pH 6.7 to 6.9"

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