Soil Ninja Horticultural Grit | 2.5L

Soil Ninja Horticultural Grit is a natural, lime-free crushed quartz aggregate designed to improve drainage, aeration and structure in houseplant potting mixes. Particularly useful for cacti, succulents and other plants that dislike sitting in damp compost, this versatile mineral component helps create a more open growing environment for healthy root development.

Unlike porous soil additives, horticultural grit doesn't absorb or store significant amounts of water. Instead, its hard, non-porous particles help create small air spaces throughout the compost, improving its structure and allowing excess moisture to drain more freely. It's also relatively heavy, providing additional stability for plants in their pots.

Why add horticultural grit to your compost?

• Improves drainage: Helps create a freer-draining potting mix, particularly beneficial for plants sensitive to prolonged moisture around their roots.
• Encourages root aeration: Creates small spaces within the compost, allowing oxygen to reach the roots more easily.
• Reduces compaction: Its hard mineral particles help maintain structure and prevent fine compost ingredients from packing too tightly together.
• Adds stability: The weight of the crushed quartz helps anchor plants, particularly useful for heavier or top-heavy specimens.
• Non-porous and lime-free: Doesn't retain significant moisture or introduce the calcium carbonate found in limestone grit.
• Decorative finish: Can also be used as a natural-looking top dressing for potted plants.

Which plants benefit from horticultural grit?

Horticultural grit is especially useful for plants adapted to dry, rocky or sharply draining growing conditions. Adding it to an appropriate compost blend can help recreate the open, mineral-rich environment their roots prefer.

• Cacti: Particularly desert species that need excellent drainage and plenty of air around their roots.
• Succulents: Including Echeveria, Haworthia, Aloe and Crassula, which can struggle in overly moisture-retentive compost.
• Agave and Yucca: Benefit from the additional drainage and stability provided by a mineral-rich growing medium.
• Snake Plants (Dracaena trifasciata): Useful for creating a freer-draining mix that reduces the risk of prolonged wetness around the roots.
• Other drought-tolerant plants: A useful ingredient when customising compost for species that prefer their growing medium to dry between waterings.

How to use Soil Ninja Horticultural Grit

For improving drainage: Mix the grit evenly through your chosen compost before repotting. The amount required will depend on the plant and the other ingredients in your mix. Cacti and succulents generally benefit from a higher proportion of mineral material than tropical foliage plants.

For creating your own potting mix: Combine grit with suitable ingredients such as compost, perlite, pumice or bark to achieve the balance of drainage, aeration and moisture retention your plants need.

As a decorative top dressing: Spread a thin layer over the surface of your potting mix for a neat, natural finish. A mineral top dressing may also make the compost surface less inviting for fungus gnats, although it won't eliminate an existing infestation.

Important: For better drainage, mix grit throughout the compost rather than simply adding a layer to the bottom of the pot. Always use a pot with adequate drainage holes and choose a suitable watering routine for your plant.

Horticultural grit or perlite: what's the difference?

Both are useful ingredients for improving potting mixes, but they behave differently. Perlite is lightweight and porous, making it particularly useful for increasing aeration without adding much weight. Horticultural grit is heavier and non-porous, adding structure and helping create a more mineral-rich, free-draining mix.

For many plants, combining different soil components offers the best balance of moisture retention, drainage and airflow.

Product details

• Brand: Soil Ninja
• Product: Horticultural Grit
• Material: Natural crushed quartz
• Properties: Non-porous, lime-free and peat-free
• Uses: Potting mix amendment and decorative top dressing
• Bag size: 2.5 litres

Before use: Rinse thoroughly with clean water to remove any dust or fine particles. As this is a natural mineral product, the colour and appearance of the grit may vary between batches.

Looking to create your own houseplant compost? Explore our Soil Ninja collection for specialist growing media and individual soil components.