4-9mm Horticultural Pumice

Our 4–9mm Horticultural Pumice is a coarser pumice aggregate that’s perfect for improving soil drainage and aeration in larger pots, raised beds, and garden mixes. Its porous structure holds both moisture and air, giving plant roots the ideal growing environment while preventing compaction. This mid-sized grade is especially popular in potting mixes for succulents, natives, and fruiting plants that prefer free-draining soils.

As part of our range of specialist and decorative aggregates, it can also be used in landscaping for a natural, pale finish that blends well with other materials. If you’re looking for quality horticultural pumice near me, Gammans supplies pumice trusted by gardeners, growers, and landscapers across the Bay of Plenty region and beyond. Call us today for a quote.

For more guidance on choosing the right material for your project, check out our article: Building, Landscaping, or Drainage? How to Choose the Right Aggregate.

Need help estimating? Try our Volume Calculator.